This is a great anti-reflective coated cemented doublet achromat erector lens in the original military packaging from the 1950s. NSN: F289-7575154, Drawing # A-7575154. We believe this is used in one of the Simpson military instruments. Packed by Libbey Ownes Ford Co. 16mm diameter x 135mm focal length. 4.5mm edge thickness. We have a large quantity of this military collectible if you want to incorporate them into your project or design. Quality lens! Unused!
