I found on my shelf a "Carl Zeiss Tessar 1:3.5 f=105mm" in a Linhof branded Synchro Compur. I guess I bought it more for the shutter then the lens. But I'm a bit wondering what this is for kind of lens.

A 105mm would be rather wide for 4x5 but it is marked a Tessar which aren't really wide lenses. But then again I might be very wrong. Is this a 6x9 lens? I'm not really capable of testing it right now.