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Review the standard procedures for measuring U.S. perforations based on the Kiusalas gauge. Learn the techniques and “tells” for determining genuine and fake perforations. See how Photoshop overlay techniques can be used and methods for expertizing Washington-Franklin and Fourth Bureau issue stamps.

Presenter:  Clark Frazier

Video Duration: 67 minutes

This is a video recording of a session that occurred during the 2020 Summer Seminar Online learning event.