WERT
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What I collect: Canada and Provinces
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Post by WERT on Mar 7, 2020 1:01:24 GMT
Thought i would start this thread being aware that some Stamp Catalogues have perforations assigned to stamps that some times are not accurate enough.
Robert
Here is an example of what i am talking about. This is a Canada B10 "Team Sports" stamp. It is assigned a 13.0 x 13.0 perforation in the catalouge (see perf. at left stamp) Accurate perf is 13.4 x 13.4 perforation (see perf. at right stamp)
I would imagine other countries have the same differences.
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renden
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Post by renden on Mar 7, 2020 14:19:47 GMT
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WERT
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Post by WERT on Mar 7, 2020 15:47:13 GMT
One more perforation accuracy measurement. I believe a lot of perforations whether it be Canada or OTHER countries are rounded off. There is so much time spent on stamp accuracy like size, colour, varieties, etc...Not much
time is spent on perforation accuracy...And that is a shame..
Robert
Below is a Scott 474 "George Vanier" stamp.
And perforations do not even line up.
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WERT
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Post by WERT on Mar 12, 2020 14:28:10 GMT
Hi guys This post is to make collectors aware of another part of stamp collecting that needs more attention. I have been doing a lot of work trying to understand assigned perforations on stamps.
It came to my attention that while some catalouges assign a perforation measurement, it is some times not true. I have many, many Canadian stamps that do not meet the criteria of perforation accuracy.
I am as we speak trying to get organizations like BNAPS to recognize that a study group be created to deal with perforation measurement discrepancies. Here is one example (and remember, some are more off the recognized perforations.) Below is a Scott 474 George Vanier stamp, according to catalouges has been assigned a perforation of 12.0 x 12.0. The information was supplied by Library and Archives Canada.
This is perforation measurement according to assigned information....12.0 x 12.0
Now here is a true perforation measurement.....11.9
Any questions, please post. Will post more EXTREME measurement adjustments. Robert
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WERT
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Post by WERT on Mar 12, 2020 14:40:24 GMT
Here is one that is more extreme... This Canadian B7 semi-postal stamp has been assigned a perforation of 13.0 according to stamp catalouges and Archives Canada.
here is the block of B7's
Here is the perforation measurement reading according to those organizations. at so called Perf. 13.0
Now here is the true perforation measurement taken at Perf. 13.4..Quite a difference.
Hey..Post your World Wide stamps with perforation adjustments.
Robert
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stanley64
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What I collect: Canada, USA, Netherlands, Portugal & Colonies, Antarctic Territories and anything that catches my eye...
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Post by stanley64 on Apr 5, 2021 8:18:15 GMT
One more perforation accuracy measurement. I believe a lot of perforations whether it be Canada or OTHER countries are rounded off. Agreed Robert ( WERT ); in fact I read an article recently where Canadian stamps, as a result of automating the perforation process, had their gauge measurement changed as result. Up until late 1962 the gauge measurement was 11,94 and from late 1962 to 1974 can be changed to 11,85.
Interestingly enough,several stamps issued during the period can be found with both the old and the new perforation measurements including the one 1952 Canada 7¢ Blue Goose Definite Airmail stamp, the 2¢ green QEII Wilding Portrait issue and the $1 Total Pole Definitive stamp among others. My own interest was in the 5¢ QEII Cameo issue that has been discovered to have both the older and the newer with its smaller perforation gauge.
The conundrum and to your point of rounding, how does one begin to measure perforations to this level when most gauges can do one significant digit at best?
Having spent the weekend looking at my own collection of Cameos, I am no closer to answering the question...
Happy collecting!
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angore
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Post by angore on Apr 5, 2021 10:08:10 GMT
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vikingeck
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Post by vikingeck on Apr 5, 2021 11:08:26 GMT
As I understand it papers being organic , can behave differently in atmospheric conditions and for many early issues paper damped for printing will show shrinkage on drying. Early perforation gauges were designed to nearest half, rounded up or down as appropriate. For most purposes 11.9 and 12 are not significant and catalogues will show “12” Those gauging 12.4 however should be rounded up to 12 1/2 , and not rounded down to 12. The Instanta and similar gauges with sliding lines and accuracy to 0.1 are much better than earlier card gauges with dots , and I know you can measure electronically to two decimal places , but for the majority of collectors , for most stamps , and for catalogue editors such precision is unnecessary . The nearest half is usually enough , beyond that madness lies! 🧐 Forgive me Vince stanley64! |
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stanley64
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Post by stanley64 on Apr 5, 2021 14:22:32 GMT
Thanks for the link angore , I had a quick play with the tool and came up with a measurement of 11,83 for the block shown which would make it of the newer perforation set. I am not convinced though given the manual effort and precision required of the software; I do have a suggestion or two for the application, but will take that conversation up with stampcollectingblog.com For now and for full disclosure, here is the article referenced earlier: Goldberg, Julian J., and John M. Walsh. "DISCOVERY OF STAMP PERFORATION CHANGES THAT STARTED IN 1962". Maple Leaves, vol 36, no. 5, 2021, pp. 243-259. Happy collecting! |
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stanley64
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Post by stanley64 on Apr 6, 2021 8:18:57 GMT
Thanks for chiming in Alex ( vikingeck) A touch of madness, perhaps; a bit folly, absolutely and you will have to forgive me for the philatelic distraction. For now, my knowledge and understanding of perforations has increased and given the difficulty of gauge accuracy, I will leave the detailed measurements of perforations to others and simply continue with measuring paper thickness to .00 decimals points. No madness there...
Happy collecting!
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angore
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Post by angore on Apr 6, 2021 10:27:28 GMT
The most significant use of the electronic tool was to check some perf measurements for stamp available only available as an image. I was able to back into the scan setting to get the measurement. In my example, it was a serpentine die cut stamp (simulated perforations) and the"perforation" measurement varied slightly by printer. The issue as usual was Scott rounded the measurement and other catalogs did not acknowledge a difference. As an aside, there is a specialty gauge for US collectors that includes 12 different Kiusalas gauge measurements for the Washington Franklin series. It has other features to assist with flat plate and rotary press printings.  |
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WERT
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What I collect: Canada and Provinces
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Post by WERT on Sept 20, 2021 3:23:46 GMT
Hello everyone I have always been a proponent of perforation accuracy.....Canada and World stamps. Yes worry about stamp size Yes worry about stamp colour Yes worry about gum type etc...etc. Perforations need more attention by stamp collectors. Here is a Newfoundland and one Canada stamp that does some time far short of accurate perforations..see below.
Here is many Small Queen perforations rather then just a couple as Catalouges set...My friend Jogil {perforation guru} does the best job on perforations of any one i know.  |
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WERT
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Post by WERT on Oct 1, 2021 15:00:06 GMT
Hi Guys Got a request..
I have a Canada Scott 1597 "High Technology Industries" stamp that i believe may have a mistake in Catalouge{s} If any one has this stamp..Would appreciate your perforation input. Catalouge shows 13.3 x 13.3 I measure 13.5 x 13.3 {could be wrong}
Thanks ahead of time for any help.
Robert
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hrdoktorx
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Post by hrdoktorx on Oct 1, 2021 16:15:01 GMT
I looked at my copy and it's definitely 13.3 by 13.3.
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WERT
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Post by WERT on Oct 1, 2021 16:43:24 GMT
Thanks for your reply hrdoktorx
Robert
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