I’m not 100% sure, but it think that’s something they do for the display versions, maybe to avoid counterfeits? Seems pretty low tech, but my regular stamps don’t have it crossed out, while the same stamps’ display model at the post office does.
Re: Glowing/fluorescing stamps
The cancellation mark does fluoresce show up under ultraviolet light, so perhaps to avoid confusion the stamps might not do that.
My spouse has saved every letter and postcard I sent them, from long before we dated.
I think I’m going to write and send a postcard today, your reply and this post remind me that I should do that more often.
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