I did search the forums for quite a while but I couldn't find any concrete information as to whether this had been identified or not.
for reference, I'm talking about the fitting here, connected to the yellow tubing underneath the banjo fitting.
Recently, I was lucky enough to come across a job lot of vintage and new old stock Clippard fittings including the following part.
Bear in mind that this one is new old stock and no where near as tarnished as the part attached to the screen used peddle is.
The knurling is a lot less pronounced in person, for some reason my camera makes it look deeper than it actually is.
It looks like same fitting to me, although I'm no authority on this so I'll let the real experts decide.
Unfortunately there are no identifying marks on it to pin it to a specific manufacturer.
I would say that since it was included along side clippard fittings that it could possibly be a clippard part itself but the lot also included some parts which were made by Legris, so who knows?
It could be made by either company, or another one entirely for all I know.