Odd item on eBay

That is not a stamp, but emblems made using an acid-resist. It's the same method I used to make Metz plaques. Basically, you create & print the emblem (which you have edited to size) on a special plastic which is heated to adhere to sheet brass. This is then dipped in an acidic solution, such as is used to make etched circuit boards. The emblem(s) is cut out of the brass sheet, then painted, and the emblem sanded with very fine paper, then sprayed with clear lacquer.

Phil

Yeah, I figured that it wasn't a 100 year old lost stamp. When I saw it I thought of you and the emblems you made. Thanks for taking a look at it and confirming my suspicion.