Ok, I've got a sheet of 18 stamps I bought at am ATM machine. The stamps have no monetary value on them, but simply say "first class". I assume they're currently worth $0.37. If the postage rate were to increase, would my stamps still be valid?
I don't ever remember seeing stamps w/o a value printed on them before.
I don't ever remember seeing stamps w/o a value printed on them before.