Boresight telescope made by Farrand Optical Co., Inc., dated 1943. Optics are clear. The U.S. Navy used these boresights to zero alignment for smaller guns, such as the 20mm anti-aircraft gun.
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Boresight telescope made by Farrand Optical Co., Inc., dated 1943. Optics are clear. The U.S. Navy used these boresights to zero alignment for smaller guns, such as the 20mm anti-aircraft gun.
