Brian is correct, it does show up in the 1938 catalog, along with "8-ball" and "doorstop" desk pen bases. But it's appearance (similar to some early '30s Morrisons I've seen) says that it was made much earlier. And I agree with him, it's the coolest of the dip-less sets ... literally screams "art deco".
From it's general appearance and the later nib, looks like it was well used through the war years and into the '50s by its previous owner. If it's going to be a "museum piece" in your collection, i'd suggest being on the lookout for a decent flat-feed nib to properly dress it out for its time period. But if you're planning on using it, or just respecting its provenance, never mind
Great pictures, BTW! "Betweenthelens" is an appropriate handle, indeed.