These are great for quickly mounting all those odd brass lenses with missing mounting flanges. This one has a maximum opening of 98mm (3 7/8") and a minimum of 22mm (7/8").
It works smoothly and locks down fine. Can hold a heavy lens securely. Has a bit of missing paint on the back, see picture. Can mount onto a 6" lens board, which I can include if I can find it. If you need a packard shutter, I may be able to find one also for an additional fee.
$250 plus postage/insurance. Paypal accepted. Happy to answer any questions, just send an email or private message.