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The engraving on the lens indicates that it is designed for a 160mm tube length and cover glass thickness of 0.17mm. This is the specification used by most West German Carl Zeiss objectives and many objectives from other leading manufacturers (e.g. Olympus).
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.