TromboneChat

Which Marc mpc would be most similar to a Bach 7C?

Looking at Marc’s website I see a 7C listed. Not sure how that matches up.

Graham Middleton?

The Marc 11c is a bigger 11c, probably pretty close feeling to some 7c

ET4 is a good one to check out too. It's a essentially an older 7C with a slightly larger backbore

The word on the street is that the Marcinkiewicz ET 4 (Lloyd Ulyate) is a copy of Lloyd's [opened-throat] Bach 7C (but of course with the Marc blank and rim).
The Marcinkiewicz ET 3 (C Loper) is allegedly derived from Charlie's Mount Vernon Bach 11C.
I prefer the Marcinkiewicz versions to Bach's.

The Marcinkiewicz 7c doesn't feel like any of my Bach 7cs. It's really nice, just different from any Bach I've owned. It has a much thinner rim and feels like it has a bigger diameter.

The ET4 is more consistent with a 7c. The ET3 is most like an 11c of any of them. The ET2 is bigger, like a 6 3/4c or almost like a 6 1/2a.