I recently received two letters from the US, both with unstamped stamps (sorry if this should not be the correct English expression^^).
My question is: Can I use them again (e.g. for a SASE from the US to me)? They look as if they were new, absolutely no sign of a postmark.
(example)If so, how can I remove the stamps from the letter? With normal German stamps, I put them into warm water and simply wait for the glue to come off.
Does that also work with US stamps (self-sticking, adhesive) or would this damage them?
Thanks for you help
xx
