A good friend of mine is forced to part with two of his prized pieces in order to pay a bill. The Skyuka R1 and the X1. The round is one of those mythical SC OA patches that is on numerous needs lists. The X1 is from the 1950s and is considered their first issue. This example is primo mint! if you are interested.
Postscript: this post originally appeared on the Patchblanket bulletin board from May 2011