This is a good clean lens; no scratches, no fungus, no internal haze.
The Copal 1 is sticking below 1/4th, but after some exercise even that began to "go through the motions". A basic CLA and the shutter is ready to go. Fast speeds sound very good and the aperture is clean as a whistle. F-scale is a screwed on plate, so adapting this shutter to another focal-length lens would be a breeze.
I don't know much about this lens and wouldn't mind knowing more. By all accounts it should be a fine performer on 4x5". As far as I can tell it is not a convertible lens.
I'm open to trading for other lenses (4x5" or Canon-brand FD) and would love to find a 120mm Angulon (trade + cash perhaps).
Or please make a cash offer that suits your budget.
International is welcome, Paypal preferred (gift option, you pay fee) and I'll pay the 3% to APUG.