Original U.S. WWII Navy 7x50 Bu. Aero. Mark 21 SARD Binoculars by Square D with Polarized Filters in Case Russian Navy The serial number is 224593B

The serial number is 224593B denoting the year of manufacture as 1887

EGA (Eagle Globe & Anchor) visor hat device

the last of which had two variations

This is a very scarce authentic WWI collection from Sergeant George B

It comes in its all steel scabbard

Original U.S. WWII Navy 7x50 Bu. Aero. Mark 21 SARD Binoculars by Square D with Polarized Filters in Case Russian Navy The serial number is 224593BOriginal 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