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This is one of the best helmets of this type that we have seen
5 inches wide by 16 inches tall and is a three-piece construction
all that remains which can be recognized from an M7 is the knuckle guard or cross piece
This was the largest payload of any bomber in the war
and three leather panels
Original U.S. WWII Sperry S-1 Bombsight in Steel Transit Case - Unissued Military Equipment This is one of theOriginal Item: Only One Available. Manufactured by the International Business Machines (IBM) the Sperry S 1 bombsight was designed by Elmer Sperry, Carl Norden's former employer. It had several distinctions from the Norden, and some advantages. The Sperry gyroscopes spun at 24,000 rpm, compared to the Norden gyros which ran at approximately 8,000 rpm. This higher rate of rotation overcame the tendency to precess, so there was no leveling mechanism