djcmh
Member 
Posts: 768
What I collect: Worldwide
|
Post by djcmh on Dec 14, 2020 7:33:10 GMT
Unitrade 2016 lists the Pirie Watermark (30d) and then a Pirie Paper not showing any of the watermark (30vii).
How in the devil does one identify a 30vii? Not finding anything clear saying how to tell if the stamp is a 30vii vs a 30a (both are greenish grey, both are perf 11.5 x 12, so I assume it must be a different type of paper)
Unitrade says 30vii is on Script Watermark paper with horizontal mesh, but versions of 30 were also printed on horizontal mesh (Duckworth III and Duckworth X papers).
So, anyone able to help explain to me how you tell if a stamp is 30vii vs 30a???
DJCMH
|
|
|
|
Post by jimjung on Dec 25, 2020 12:39:41 GMT
Hope this helps a bit anyways. It was reported to be a thicker paper - Duckworth: "Menich reports that the paper is unusually thick (.081 - .107)." Now I didn't measure mine when I owned it but that measurement, if accurate is very thick. Normal Wove paper is in the .0026-.0035 range. Very Thick paper in Unitrade listings are .0035-.0045 range.   |
|
renden
Member
Posts: 8,705 
What I collect: World W collector with ++ interests in BNA (Canada etc) and USA
|
Post by renden on Dec 25, 2020 14:33:57 GMT
jimjung - always fascinating to read about measurements of paper (in stamps) - Common collectors like me do not have the equipment to do that and what about characteristics of various papers  René
|
|
|
|
Post by jimjung on Dec 25, 2020 16:01:41 GMT
Just an FYI - I have heard a rumour that the thickness varies with this paper so check with the experts before discounting what you think may be Pirie paper. I have also seen two different perforations: 11 1/2 x 12 and 12 x 12. And two shades, one more Greenish and one more greyish.
|
|
watermark
Member
Posts: 62
What I collect: My main collecting area is focused on Canadian stamps printed from steel engraved plates. Specifically re-entries and constant plate varieties.
|
Post by watermark on Dec 26, 2020 12:31:50 GMT
There are some reasonably priced micrometers available for measuring paper thickness. The one I use is pictured below.  There are other brands available. This one can read in either inches or millimeters. I recommend three to five measurements of a stamp for correct thickness range as paper can vary in thickness throughout the span of a stamp. These can be found for sale through a computer search. I recommend buying a new one as it should be factory tested for accuracy. Mine has a measuring range of 0-1" with a resolution of 0.00005in at a standard operating temperature of 20 degrees C. Mike |
|
Ryan
Member
Calgary, Alberta, Canada
Posts: 2,720
What I collect: If I have a catalogue for it, I collect it. And I have many catalogues ....
|
Post by Ryan on Dec 26, 2020 21:07:54 GMT
I recommend three to five measurements of a stamp for correct thickness range as paper can vary in thickness throughout the span of a stamp. And for those interested in buying a micrometer, make sure you get one with a ratchet on the end of the thimble - on the tool pictured above, the ratchet is the extra bit on the very right-most end. Using the ratchet to measure your stamp will give you a repeatable "tightness" (it's like the gas filler cap on a car, once it gets tight enough it starts clicking instead of getting any tighter). If you don't have a ratchet, you might turn your micrometer into a C-clamp (and a paper press, squishing your paper thinner ...). Ryan |
|
René
