What's that lens? (Identifying a 2.8 Tessar)

[Laurent]

I've been "given" (I paid €120 for it, so it's almost a gift!) an Ahel1245 enlarger with a Componon-S 150mm and a few other things.

Among these things there was this lens, partly disassembled, and I don't know what it fits or what it's worth...

 

[BrianShaw]

It might help if you show the lens mount side also.

 

[RalphLambrecht]

I've been "given" (I paid €120 for it, so it's almost a gift!) an Ahel1245 enlarger with a Componon-S 150mm and a few other things.

Among these things there was this lens, partly disassembled, and I don't know what it fits or what it's worth...

View attachment 421682View attachment 421683

The name and the focal length point to a 4x5" enlarger and its regular lens. If it is a Schneider Componon S Tessar, it should be stellar. what'a bit puzzling is that you said 150mm, which makes it a lens for medium or even large format, where the engraving on the lens identifies it as a 50mm, which makes it a lens for 35mm. In any case, I'm not sure of the value, like not much, but who cares if it works?