Using A Gold Leaf Stamp

Greetings folks,

So, I found this stamp in a parking lot.



It was in a plastic case but had been run over a few times, as evidenced by the crease that runs down the entirety of the right side, and a scratch on the bottom right where the gold leaf is entirely gone. With pristine examples going for a mere $5 on eBay right now, I assume it's safe to say nobody wants this specimen in their collection *** Edited by Staff - Please Review the rules that you agreed to when you registered. ***

Anyways, I got to thinking it would be a pretty neat stamp to use on a postcard, especially to someone who lives far from the U.S.A. and rarely gets American mail, and who was previously wowed by the scallop-shaped global forever stamps they've received on previous postcards from my travels. I wanted to know if any of you have had experience with this type of philatelic memorabilia actually being used at face value, and what the results were? It's got no gum, so I might need to pack some super glue or something to keep it on (rather hefty card stock it's die-cut from..) but in theory if it was purchased from the postal service, and its denominated, it should be usable, right? I mean, proof sets from the U.S. mint will still work in a parking meter if you break 'em open...

So what do you guys think? Would the USPS reject it and toss my card? (Yes, I'd include a couple normal stamps with it so it exceeds the $1.15 needed for international first class..)

Sincerely, an obvious non-collector of stamps.

*** Moved by Staff to a more appropriate forum. ***

it is not a stamp and not usable