The rubber stamps were designed by Ken Friedman, Chuck Welch, Bill Gaglone, Steve Random, Luce Fierens, and Ed Varney on the occasion of an exhibition by Ken Friedman, entitled, Rubber Stamps, at Stamp Art Gallery in San Francisco. The original Friedman rubber stamp was designed by Wolfgang Feelish and became among the most widely reproduced stamp in international mail art networking. -- Source of annotation: Marvin or Ruth Sackner.