The lens is marked BL and has no shutter and aperture is marked 4.5-16. It is a very dark olive drab color.
It has a date painted near the mount- Nov 28 1966 and a -8 is painted on the side as well as written in pen on an inspection sticker.
From what little I have found online it likely came from a Xerox machine.
I held it up to a piece of printer paper and to my surprise it covered it with no problem. I had assumed being a 4.5 it was likely a Tessar design but it is about a third smaller than my other Tessars with similar coverage.
If anyone knows about this lens I would really like to know-
Focal Length
Lens Design
Best way to open it for cleaning
impressions of it as a camera lens
what the -8 is indicating
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