Placed here in case anybody needs it.
This is a rough comparison of the larger Monette trumpet mouthpiece sizes.
2Supposed to be equivalent to a Bach 1 1/4C but I feel it is closer to a 1 1/2C
1-1The biggest Monette trumpet mouthpiece. Roughly the size of a current Bach 1 but the rim is semicircular with the high point in the middle.
1-2Flatter than the 1-1 making it feel smaller and the cupis not quite as big. Something like a Bach 1X.
1-5Very similar to a Bach 1C.
The 1-5M is the same rim but with the 1-2 cup making it feel a bit like a NY Bach 1.
The 1-5D is the same rim but with the even deeper 1-1 cup.