The catalogue edited by John Held Jr. describes the historic aspects of Klein's blue stamp that was used to address a letter in 1957 and was cancelled by the French postal service. The stamps were made from postal service sheets of perforated stamps by either dipping them into blue paint or hand painting them according to different authorities. -- Source of annotation: Marvin or Ruth Sackner.

The rubber stamp made by John Held Jr. and Bill Gaglione is a reproduction of the dated cancellation (6-5-1957) that cancelled Klein's "blue stamp." The stamp is mounted in p\apercard in the box with the color of "Klein Blue." -- Source of annotation: Marvin or Ruth Sackner.

The rubber stamp made by John Held Jr. and Bill Gaglione is a reproduction of the dated cancellation (6-5-1957) that cancelled Klein's "blue stamp." The stamp is mounted in p\apercard in the box with the color of "Klein Blue." -- Source of annotation: Marvin or Ruth Sackner.