This is, no doubt, a magic lantern petzval.
Specs: 5 1/2" focal length; approx 6" image circle; approx f3.5. Weight: 11oz Height: approx 3". Outer barrel has no focus knob mechanism but is threaded. No flange. Diameter at threads: a little over 2". Rear glass: approx 40mm.
Glass is clean with some cleaning wisps, as to be expected. Elements easily unscrew for cleaning or general 'messing-around-with'. Probably best on 4x5 or 5x7 depending on what you want to do with it and whether or not you want vignetting.
Price: $132 shipped in the USA. Paypal ok, but my dog strongly prefers USPS money orders as the bank tellers give her treats when we deposit them, and it makes her canine day... $$ to apug if sold here.