I had one years ago. It's still around here someplace but hasn't been on a banjo in a long time. It's way too heavy and the compensation isn't really that great either. I believe it was that bridge that Roger Siminoff had in mind when he said something like "by their very nature, compensated bridges can never sound as good as a standard bridge". The Hatfield compensated bridge is much better as is the design used on the Snuffy Smith compensated bridges and others.
I tried one of those bridges, and as well as compensated, I found the sound constipated! Five minutes on the snag grinder and a lot of excess wood quickly removed and they look like this. Sound much better but not quite on par with a quality bridge. If you have one lying around that is gathering dust give this exercise a try. It will amaze you the difference in sound before and after!
Bart Veerman, bridge maker extraordinaire, has a system where you measure the string length for each individual string and for your specific banjo. He will then custom make a compensated bridge that really works. It's just not necessarily interchangeable with another banjo.
I remember when they were introduced. I was in the 5th String store in Berkely California. The package had the name Shubb like the capo, so I think he was the inventor. I bought one and used it for about a month. I replaced it and never looked back.
A local picker started making a better one by bending standard Grover bridges over a hot iron. The angle of the bend matched Shubb's angle. The bridges were marked by a distinctive burn where the wood met the iron. I must say the bent bridge worked as well to correct intonation. Being no heavier than a standard Grover, it didn't kill the tone like the Shubb.
The Shubb and the Grover were not identical. Elderly sold an ebony mute that fit one and not the other. I still have a Grover or two lying about - none are on my banjos anymore - still have the mute, too but have no idea where it is (sitting in a case, no doubt).
I didn't think they sounded so bad but, when I went to a wound third, they became useless to me.