docphgeek
Member
Posts: 51
What I collect: PNCs, US-Definitives, Machins, BOB, Israel, Engraved
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Post by docphgeek on Mar 14, 2022 19:26:51 GMT
PNCs or Plate Number Coils are definitive coil stamps with a plate number printed at the bottom. They are collected used as PNC1s, and mint in strips of 3(PNC3s), 5(PNC5s), or more. Personally I find it more of a challenge to hunt down and find all of the used PNC1s of a series than their mint versions, but the mint strips do look awesome when displayed. I didn't see a thread dedicated to PNCs so I started this one and I will post pics of PNCs I come across and would love it if you all would do the same.
Here are a few PNC5's I came across in one of my stock books.
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docphgeek
Member
Posts: 51
What I collect: PNCs, US-Definitives, Machins, BOB, Israel, Engraved
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Post by docphgeek on Mar 15, 2022 14:58:51 GMT
Found this one in a charity mix today
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docphgeek
Member
Posts: 51
What I collect: PNCs, US-Definitives, Machins, BOB, Israel, Engraved
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Post by docphgeek on Mar 19, 2022 12:35:28 GMT
Here are the two PNCs available in the 42c Flags of or Nation Series issued in 2008
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docphgeek
Member
Posts: 51
What I collect: PNCs, US-Definitives, Machins, BOB, Israel, Engraved
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Post by docphgeek on Mar 22, 2022 14:07:27 GMT
How I am doing the PNC1 varieties of the 41c American Flag Issue
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docphgeek
Member
Posts: 51
What I collect: PNCs, US-Definitives, Machins, BOB, Israel, Engraved
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Post by docphgeek on Mar 25, 2022 12:21:32 GMT
Yesterday I got access to a banker box of old business mail that was on its way to be shredded. Before it left, they let me take the stamps. Much of it was metered, but suprisingly there were a fair amount of stamps. These are the only PNCs that I found out of the lot.
Good news is their are 30 more boxes I am going to be able to search.
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jpotx113
Member
Posts: 460
What I collect: USA, Germany, Croatia, Slovenia, Machins, misc. WW
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Post by jpotx113 on Apr 6, 2022 19:58:09 GMT
Bryan is not too far away (only have to cross two county lines to get there). Thirty boxes...sounds like something fun to sort through. I've been picking up the mail at the county tax office here in Crockett since October (large volume of mail from then until about February due to payment of property tax).
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tomiseksj
Moderator
Woodbridge, Virginia, USA
Posts: 6,276
What I collect: Worldwide stamps/covers, Cinderellas, Ohio Prepaid Sales Tax Receipts, U.S. WWII Ration ephemera
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Post by tomiseksj on Apr 14, 2022 16:53:58 GMT
This arrived today on a Smithsonian Institution mailing. On February 1, 2022 the USPS issued the Butterfly Garden Flowers non-denominated, nonprofit organization stamps (5-cent value) in two designs. The coil stamps featured illustrations of two flowers that attracted butterflies; scabiosas (Scott 5664) and cosmos (Scott 5665). The plate number coil stamp pictured below shows the cosmos design. The stamps were printed by Banknote Corporation of America and issued in coils of 3,000 and 10,000. Plate numbers, "B" followed by 4 single digits, appear on every 24th stamp below the image.
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angore
Member
Posts: 5,385
What I collect: WW, focus on British Empire
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Post by angore on Apr 15, 2022 10:06:16 GMT
I have not seen that stamp in my non-profit mail.
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stanley64
Member
Posts: 1,835
What I collect: Canada, USA, Netherlands, Portugal & Colonies, Antarctic Territories and anything that catches my eye...
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Post by stanley64 on May 2, 2022 8:40:53 GMT
Perhaps one of the more esoteric areas of Plate Number Coiling (PNC) collecting is that of “back numbers” and although not expensive, depending on the issue, can provide quite the challenge.
For the mathematicians among us, what is the probability of finding the desired back number in any one of the five positions and still maintain the middle plate number visible on the front?
Have fun and happy collecting!
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Ryan
Member
Calgary, Alberta, Canada
Posts: 2,722
What I collect: If I have a catalogue for it, I collect it. And I have many catalogues ....
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Post by Ryan on May 6, 2022 20:16:18 GMT
For the mathematicians among us, what is the probability of finding the desired back number in any one of the five positions and still maintain the middle plate number visible on the front? That will be different for each different combination of back stamp frequency and PNC frequency. In the case of the issue you show on your album page, some combinations of backprint and PNC are clearly not possible. If you want the backprint to be in the middle of a strip of 5 and the PNC to also be in the middle, it's possible that it will never occur on a roll of 3,000. Imagine the PNC is on the 1st stamp on the roll. Since it comes on every 14th stamp, it will also be on stamp #15, #29, #43, #57, #71 ... . If the backprint is on the 2nd stamp on the roll, then since it comes on every 10th stamp it will also be on stamp #12, #22, #32, #42, #52, ... . No matter how long you look down the coil, you'll never get the backprint to line up on the same stamp as the PNC. If both backprint and PNC start on an even-numbered stamp on the roll (or both on an odd-numbered stamp) then you'd find the two lining up on the same stamp once every 70 stamps. (e.g., stamps #1, 11, 21, 31, 41, 51, 61, 71 would have a backprint, stamps #1, 15, 29, 43, 57, 71 would have a PNC.) And if you're looking for any random location pairing, then let's look at a strip of 5 stamps coming from a random spot anywhere on the 3,000 stamp roll. First, consider the PNC. If we use the numbering method above and say that the PNC is on stamp #1 of the roll, then it's obvious that a strip of 5 made of stamps #1-5 on the roll will include the PNC on stamp #1 but a strip made of stamps #2-6 won't have a PNC anywhere - it misses the PNC that was on stamp #1 and it misses the next PNC on stamp #15. Looking at it that way, a strip of 5 stamps taken from each of the first 14 possible positions on the roll will have a PNC on only 5 out of the 14 strips (a strip starting at stamp #1 has the PNC on stamp #1, and strips starting at stamps #11, #12, #13 and #14 will all catch the PNC at stamp #15). This pattern repeats every 14th stamp, so 5 / 14 = 35.7% of all possible random strips of 5 will have a PNC. Now look at the backprint. Using the same logic, only 5 out of 10 strips will have a backprint on them, or 50%. If we started with a huge random pile of strips of 5, we have already thrown out all but 35.7% of them because they didn't have a PNC. Now we need to throw out 50% of all the random strips we have left, because they won't have a backprint. We're left with 17.9% of the original pile of random strips, or 5 out of every 28, which have both a PNC and a backprint somewhere in a random place along the strip of 5. But you're picky - you wanted the PNC to be only in the middle position of the strip of 5. So, 4 out of the 5 strips in our random pile are junk and need to also be thrown out - the PNC will be evenly distributed between positions #1-5 on the strip, but you only want position #3, the one in the middle. That leaves us now with only 3.6% of the original huge random pile of strips of 5, or 1 out of every 28. And remember, that is only true for random pairings. If the printing method used is ALWAYS repeatable and it ALWAYS forces the PNC and the backprint to both occur on even-numbered stamps (or both on odd-numbered stamps), then you get the strip you want 4.3% of the time, or 3 out of every 70 strips - if one is on an even-numbered stamp and the other on an odd numbered stamp (like my example earlier), then it's impossible to have both the PNC and the backprint on the same stamp, and your chances of getting a strip with both of them on it drop to 2.9%, or 2 out of every 70 strips (1 out of 35, if you like reducing the common factors ...). Ryan
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stanley64
Member
Posts: 1,835
What I collect: Canada, USA, Netherlands, Portugal & Colonies, Antarctic Territories and anything that catches my eye...
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Post by stanley64 on May 7, 2022 9:23:34 GMT
Great stuff Ryan ! Thanks for taking up the challenge and even more importantly, sharing the logic behind the mathematics; both are appreciated :-) I am missing a couple of strips from the Tiffany Lamp stamp issue with the back number in the top position and a few in the bottom, but will keep looking...
Have fun and happy collecting!
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philatelia
Member
Captain Jack - my best kiloware find ever!
Posts: 3,440
What I collect: Ireland, Japan, Scandy, USA, Venezuela, Vatican, Bermuda, Austria
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Post by philatelia on Jul 4, 2022 15:21:15 GMT
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philatelia
Member
Captain Jack - my best kiloware find ever!
Posts: 3,440
What I collect: Ireland, Japan, Scandy, USA, Venezuela, Vatican, Bermuda, Austria
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Post by philatelia on Jul 4, 2022 15:27:24 GMT
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philatelia
Member
Captain Jack - my best kiloware find ever!
Posts: 3,440
What I collect: Ireland, Japan, Scandy, USA, Venezuela, Vatican, Bermuda, Austria
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Post by philatelia on Jul 4, 2022 15:29:07 GMT
USA Transportation coil major misperfs errors from my collection
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tomiseksj
Moderator
Woodbridge, Virginia, USA
Posts: 6,276
What I collect: Worldwide stamps/covers, Cinderellas, Ohio Prepaid Sales Tax Receipts, U.S. WWII Ration ephemera
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Post by tomiseksj on Jul 4, 2022 20:47:27 GMT
Here is a plate number coil of one of the two butterfly garden flowers stamps issued on February 1, 2022 in Pine Mountain, Georgia. The self-adhesive (5 cent) nonprofit definitive coil stamps come in coils of 3,000 and 10,000. Each coil includes two designs, illustrations of the cosmos (shown here) and the scabiosas. Scott has identified the stamps as 5664 and 5665, respectively. This scan of the stamp against a black background has had its exposure adjusted to make the white background appear of uniform consistency. This scan of the stamp against a black background has not been adjusted. I am assuming that the mottled appearance is due to variations in thickness (and therefore translucence) of the plasticized material that the stamp is printed on.
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stanley64
Member
Posts: 1,835
What I collect: Canada, USA, Netherlands, Portugal & Colonies, Antarctic Territories and anything that catches my eye...
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Post by stanley64 on Jul 5, 2022 9:59:35 GMT
Thanks for the showing philatelia ; those are some real gems there ;-) Seeing the Stutz Bearcat with its partial number, both top and bottom, as part of a miscut, reminded me of an error from this issue in my own collection,
Transportation Issue, 1995. Stutz Bearcat 1933 - Plate n.º 3
From the Plate Number Coil Collectors Club website, the enlargement below shows the 'Polishing Cloth' constant plate flaw or error and exists on the numbered stamp from this plate and can be found near the center of the hood. At the end of the day, what is a Stutz Bearcat without its polishing clothe...
Have fun and happy collecting!
N.B. "Permission is granted to quote material from the PNC3.org web site provided that proper credit is given".
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philatelia
Member
Captain Jack - my best kiloware find ever!
Posts: 3,440
What I collect: Ireland, Japan, Scandy, USA, Venezuela, Vatican, Bermuda, Austria
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Post by philatelia on Jul 5, 2022 12:51:02 GMT
Hah! That’s certainly a fitting plate flaw. Lol! Clever names certainly makes them much more memorable. Thanks for sharing that.
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stanley64
Member
Posts: 1,835
What I collect: Canada, USA, Netherlands, Portugal & Colonies, Antarctic Territories and anything that catches my eye...
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Post by stanley64 on Nov 13, 2022 10:32:40 GMT
PNCs or Plate Number Coils are definitive coil stamps with a plate number printed at the bottom. They are collected used as PNC1s, and mint in strips of 3(PNC3s), 5(PNC5s), or more. Personally I find it more of a challenge to hunt down and find all of the used PNC1s of a series than their mint versions, but the mint strips do look awesome when displayed.
Indeed docphgeek , a complete set of mint strips do have a their appeal,
1992 29¢ Flag Over White House (Plate Number Coils 1-16)
Looking at these again, one might be inclined to substitute all the even numbered ones with PNC7s, just for the visual interest, but that will have to wait...
Have fun and happy collecting!
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stanley64
Member
Posts: 1,835
What I collect: Canada, USA, Netherlands, Portugal & Colonies, Antarctic Territories and anything that catches my eye...
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Post by stanley64 on Mar 26, 2023 11:09:05 GMT
From the recent purchase of USA Transportation coils alluded to in this thread here, I was able to add several new items, complete a few series, and add of a couple of Tiffany Lamp strips with their back numbers. Now, there is only one strip each, i.e. one top and one bottom, to complete the series
Whilst the Tiffany Lamp strips were relatively inexpensive when compared to some of the other strips purchased, they made my hear sing; pure philatelic joy and just good fun...
Have fun and happy collecting!
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