This is probably a magic lantern petzval. Focal length: approx 5", image circle: approx 5". Rear glass is about 40mm, so this lens is around f3.2. Focus knob mechanism works well.
I found a non-original flange that fits this lens in my 'junk box', so a flange IS included with this one. Flange diameter 3", so will easily fit on a 3 1/2" or larger board. Lens is 3" tall.
Glass is good with normal expected cleaning wisps. In photo below, I forgot to take the front element out of the housing, but it IS there, in the piece left middle of the photo...
Price: $132 shipped in the USA, money order preferred, paypal ok. % to apug if sold here.