Up for sale is a rare and authentic M42 Tank Periscope, part number 7645544 – a genuine Cold War-era U.S. Army optical sight, likely used in armored vehicles such as the M41 Walker Bulldog, M48 Patton, or early M60 series tanks.
 
-Crystal-Clear Optics – The lens system is in exceptional condition: no fogging, no scratches, and razor-sharp clarity.
-Part Number 7645544 – Closely related to NSN 1240-00-864-2933 and P/N 7645543, this periscope is part of the same family of rugged, field-proven optical gear used in American armored forces.
-Built for the Battlefield – Heavy-duty construction with military-grade metal and optical components. Designed to withstand harsh environments and combat use.
-Verified U.S. Army Issue – As seen in official ordnance and fire control equipment manuals (U.S. Army Catalog F256), the M42 series was standard in several Cold War tanks.