What is this???? Contax lens oddity

I does sorta look like a Contax RF mount, doesn't it. I didn't know enlargers used that mount, but could be; most all I've seen are Leica 39mm thread. The description text missed the "5"... Lens ring says F=5cm, so it's a 50mm lens. No mention of max aperture...
 
An enlarger lens usually has an F-Stop adjustment. This looks like the kind of lens used in a Lab for copy work or recording instrumentation.
 
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