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The stamp at right is C35 (wet print). However the stamp at left is C35b (dry print). The standard Scott WW catalog does not distinguish between to 2 printing varieties. They are listed in the Scott US Specialized catalog. The catalog value for both used stamps are the same. The catalog value for a MNH C35b is slightly higher.
This stamp represents one of several stamps in which BEP began experimentally in 1953 to change the printing process to use a "dryer" (less moisture content) -- hence the term "dry print".
The slight "color run/bleed" into the background is a general way to distinguish stamps produced by "wet printing". However, that is not the best way, as I can always show you a few dry printed stamps that look similar. The best way to guarantee a wet/dry print ID, is to collect them as plate number singles. The wet/dry print was done on very specific plates, so if you know the plate number, you are assured of a dry/wet print variety. These plate numbers are documented in Durland's Plate Number catalog.
Thanks Khj,you once again extend my vision,extremely grateful.

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I have a 2005 Durland Plate Number Catalogue. I'm at work right now, but I'd be happy to post the plate numbers for the wet/dry printings this evening, if you wish.
David
Many thanks David,you're so kind

.I don't need these plate numbers now,because I only have these 2 stamps in my hand

.I will consult you when I got the sheets.
Thanks again for your help.
Best regards from China,
ZhangCheng