I have a few of the first US Postal Cards but I am having no success in being able to see the watermarks. I tried lighter fluid, looking at the card held up to the sun, and both UV lights.
I use my Ott light, inverted, and a mask cut out of cardboard to shield my eyes from the excess light. Works quite well even for separating UX4 from UX5.
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Posted 10/15/2025 6:02 pm
