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Hi. I saw these at the auction today (as did many other collectors, as they were well publicised on line). I made appropriate bids on them, but did not win. They are Old English, by Arculus / Walsh Walsh - the usual loose set-ups. Probably date to the 1920 - 1940 period. I think that they are originally paperweights that someone has mounted on relevant door hardware, probably a long time ago. I have never seen factory mounted versions of these - unlike Richardson doorknobs, which turn up from time to time, and were clearly made for that purpose.
I don't think you were lucky...you just paid more than any one else was prepared to pay - but a reasonable price if you want to use them in your home.
Alan
PS - the images look very like those from the auction house website ... you need their permission to reproduce them here.