Original U.S. WWII Sperry S-1 Bombsight in Steel Transit Case - Unissued Military Equipment black horsehair comb and genuine

black horsehair comb and genuine leather liner

This was the largest payload of any bomber in the war

which signifies maker Thomas Firth & Sons Ltd of Sheffield

This is one of the best helmets of this type that we have seen

Original U.S. WWII Sperry S-1 Bombsight in Steel Transit Case - Unissued Military Equipment black horsehair comb and genuineOriginal 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