It's Huge, it's 230mm, and it's a Tominon

I vote for the machine theory. It's way to big and heavy for 99.44% of all large format cameras and shutters. It was probably meant to be used without an aperture. Probably the only thing that could vary would be the distance (perhaps not), and the light/exposure time.

Does it have a thread on the rear?  What's the diameter/f-number?

A quick measurement with a framing square shows the focus distance is 7 1/2 inches, but that also means that the image circle is slightly under 8 inches. Keep in mind that I'm doing the measurement without the aid of any baffles or barrel tubing, so I'm guessing at where the edge of the circle seems to be. If that's close to correct, then I'm wondering where it might work as a large format lens. I'll try it as a free-lens test on a Speed Graphic 4x5 once I dig it out, but I'm guessing that I won't have enough focus throw with the bellows to get in focus.

Here's a snapshot of the lens reflections...



After taking the shot I noticed that there's a color difference in what at first glance was the 'purple' layer, and it's obviously too green-blue to match the purple in the other group. I'm not sure why that is, but it certainly is a significant difference.

The hunch that these might cover 4x5 format seems to be correct. After pulling out the Speed Graphic, I did some preliminary tests without shooting any film, just to satisfy the question of vignetting, focus, and coverage.

BTW...I would caution anyone reading this and wanting to try the same with a large, heavy, and somewhat slippery lens like this... a robust tripod really is a necessity. A Manfrotto 3120BPro and an Induro PHT0 3-way panhead that I use for most critical shooting is capable of taking on all the weight and keeping things balanced well, but I'd be suspect of anything considered to be a 'light' or 'travel' tripod of doing the same job.

There's one glaring issue if I were to try to construct a proper full-time mount for this lens on Graflex lens boards... the lens is almost equal in diameter to the width of the lens board's outer dimensions, so there would have to be some custom fabrication of a new one, and not trying to retrofit a standard pressed metal blank. There's no room to accommodate the locking tabs to hold the board in place without some serious engineering of a mount that the lens could slide into and be secured in some type of clamping ring. The only other option might be to butcher a donor front standard in order to make a permanent mount onto it, rather than a removable lens board, but that seems like it would almost turn this into a fixed-lens camera. Unless... a slew of other lens boards were fabricated in whatever new opening would be created. Seems like too much work to get this one lens added to one's lineup of other, already existing lens choices.

Aside from the How-To question, there's hope for actually using this in much the same way that others have retrofitted the Kodak Aero Ektar from WWII era bombers and reconnaissance aircraft, with one other caveat on large format. Since these have no internal iris and can't be fitted to standard shutters, they might only find a home on Speed Graphic 4x5's or similar cameras - where there's a vertical internal focal plane shutter - or on a standard view camera that can make use of 'bulb' timing on slower film. The linked forum post from earlier suggests it's possible to make these work on 35mm, in much the same way a projector lens is adapted, and I suspect the same would work for medium format too. 

So... here's the pudding and proof...






There's internal reflection in the ground glass shot from the outer shell of the focusing hood, so it looks like there's vignetting, but there isn't. My eyes don't judge the aperture on the Tominon at f/4.5 either. It seems at least a stop faster than the Kodak 127mm f/4.7. That's one of the 'kit' lenses on this model, and what was mounted before swapping out to the Tominon test fit. There are a few more shots posted to a gallery in the testbed that expand on these 2, and shows the view from the 127mm

Although it may not fit on a Wista-sized board, there are plenty of 4x5 cameras with larger 4x4", etc. boards that would work with minor modification. And even a smaller board could be used with a small extension cone. I see the bigger problems as the sheer weight on the front standard -- and keeping it parallel. Also, the resolution would undoubtedly improve with an aperture of some sort -- even a simple Waterhouse stop -- BUT open all the way should be great for portrait, etc. work!!!

Is there a filter thread on the front by any chance?

I have a Mamiya 37mm fisheye permanently attached to a Wista board. It has a Seiko shutter built in. Produces a circular which fits perfectly on 4x5 film:

www.subclub.org/fujinon/gonefishin.pdf

Apparently, adapting projector lenses to fit onto cameras is the latest rage. There is a seller on EBAY who sells them for several different cameras, and there are websites that tell you how to DIY -- like this one:

jeffandmichelephoto.com/learn/how-to-adapt-projector-lenses-to-pentax-67

I think I'll stick to using "close-up lenses":

www.subclub.org/fujinon/softfocus.htm