Dan, the TP roller blind shutters were still being made up to the very early 1960's although technically the company closed before WWII. They were almost standard on British wood & brass cameras declining with the advent of the Compund & Compur shutters. They have big advantages over the US made Packard shutters as the range of shutter speeds is useful 1/15th to 1/90th & T, if you have the pneumatic valve & release then the range extends to 2 seconds to about 1/4th or 1/8th in addition they can work with a variety of lenses.

Yes I'd agree that fitting a lens to a more modern shutter is a good option, however those Illex shutters are rare in the UK as theyb were never sold here new, same goes for Betax/Alphax shutters.