prestamp means prior to the introduction of adhesive postal stamps. Lexicurio rates it Sui generis — a strength score of 87 out of 100.
Etymology
From pre- + stamp.
adj
- Prior to the introduction of adhesive postal stamps.“a stampless cover”
verb
- To stamp in advance.“As for prestamping the return envelope, many of us are at odds with those who feel the return envelope must be stamped before the proposed guest will consider mailing back the reply card.”