Acquired these four glass drawer knobs recently. They have a slight pink/mauve tint to the pressed glass and I guess were a cheap form of drawer knob having been moulded with a glass screw section to go into the drawer front. I can recall my grandmother having similar knobs on her Victorian furniture. They each have a minute Class III registration mark with various levels of crispness. Between them I worked out that it was for 12 September 1868 Parcel 2. There is no registered design on the database with that number, but I found an 2017 conversation on this forum between Paul S and Agincourt17 which mentions 221520:
Paul S. "Regarding 221520 - the original drawing states CLASS III, and shows what appears to be an ornamental draw knob, the stub of which has been given a threaded profile - so presumably you could screw it into a draw front ?? - I can't imagine it's a decanter related piece. Again, both the original drawing and the Register lack any text description, but as you'll see when I do get to post this picture, it does look to be a glass draw knob......... "
Agincourt17. " RD 221520, registered 12 September 1868 - Parcel 2 (with registrant given as E Edwards, with address as 49 St. Paul's Square, Birmingham). No description of item given. Class 3: glass."
This fits my knobs exactly.
Hope it fills a gap. Feel free to use images for reference purposes for others.
Michael