Two official glossy 10 x 8 numbered NASA photographs attested to as being from the collection of Dr. Paul W. Gast, an American geochemist and geologist (1930-1973) who led geoscience management of the Manned Spacecraft Center in preparation for Apollo mission sample return from the Moon. He served as chief scientist of the Apollo Lunar Science Staff and was one member of the science consultant group known unofficially as the 'Four Horsemen,' along with Jim Arnold, Bob Walker, and Gerry Wasserburg. Both photos feature composite images of the lunar surface and its rocky and rolling terrain, with one picturing an Apollo astronaut during an EVA; the photos are numbered S-73-21474 and S-73-15916 (red), the reverse of the latter bears “A Kodak Paper” watermarks, and both are annotated and initialed by Sandy Clarkson of The Right Stuff, Inc., “Gast Collection.” In overall fine condition. Accompanied by a signed certificate of authenticity from Clarkson.
