送交者: 4U4luC2 于 2005-8-15, 13:52:25:
回答: pre-八十年代人 were not that better either 由 HunHunSheng 于 2005-8-15, 13:38:29:
coat the postage stamp with a thin layer of wax(using a candel), and you can scratch off the wax along with the ink mark from the PO's date stamping. It can be used back and forth a couple of time.
I never put it into practice though, mainly because I was a kid and did not have the need to send letters to anybody.