What do I have, and is it worth anything to anyone?

I'd venture to guess its an off brand of lens. MC or MD mount.

135mm f2.8 is a great lens for portraits but this is probably an OK lens at best.
 
Kamero was a store brand (for K-Mart (which included Kalimar) or another chain like that). The lenses were probably made in several different camera mounts or possibly in interchangeable adapter mounts. I remember the name being on tripods, flashes and other pieces of low-priced photo gear from the 80's
 

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