No idea, I've only seen 3 including this one, the other on the slant thread and the last being a manky bent up one on the E Bay.
This should be an interesting shave once dialed in. The weight or lack of it and the huge gap is as gentle as cvan be with short strokes. Not one to race around the face but a very efficient one none the less.
I hope you enjoy it but there are still some other bakelite slants to come in the next few weeks. The Trumpf and Fasan are little gems in my eyes and would be interesting to see if it's just me that like them as much like I like this one.