[bruce bailey]

Interesting that you bring this up. I have played soprano for 0ver 55 years with Selmers, Links, Vandorens and anything I could find. I got a Yamaha to use on a C soprano from a SOTW recommendation. I found that it was excellent on the Bb and seemed to play like an Ebolin Brilhart. It may be worth a try as the 4C (not 4CM) was very Brilhart like and is now my go to for soprano. They are quite cheap too around $25.
I have a series IV Buescher out on loan and put a 4C on it! If you need a TT soprano, let me know!

 

[bruce bailey]

The 4C is .047" and is very similar to the Brilhart in shape, made of plastic. The 4CM is closer to a Selmer S-80 and is .049".

 

[bruce bailey]

The 4C should be the same as the 3C. The Metalite is an entirely different design from the old Brilharts. The Graftonite is closer to the old ones but still different.