Original U.S. WWII Navy Mark 21 SARD 7x 50 Binoculars by Square D - Bureau of Aeronautics Issue Russian Maxim 1910 cylinder and even on the

cylinder and even on the barrel wedge

with a clear cartouche near the lower lock screw

leather washer missing

The 'Advance Sector

Thale /Harz

Original U.S. WWII Navy Mark 21 SARD 7x 50 Binoculars by Square D - Bureau of Aeronautics Issue Russian Maxim 1910 cylinder and even on theOriginal Item: Only One Available. This is an excellent condition pair of WWII U. S. Navy Mark 21 SARD 7x 50 Binoculars by Square D specifically designed for the Bureau of Aeronautics. When the mission was to observe movement across a wide expanse of sky or water then a binocular with a much wider field of view was justified. Several wide angle binocular models were commissioned specifically for the Bureau of Aeronautics whose vital work included