Bach Mt Vernon 11 with stamps

Euphman06 · by **Euphman06** » 2024-03-27 9:03 p.m.

I either can't search with correct terms or am a bit thick...but I can't seem to find other Mt Vernon mouthpieces like this one? What do the extra stamps mean?

It has the number 11 on the cup, a letter F on the throat, and the number 413 on the shank.

Thanks, and hello! This is my first post, have been reading the boards thinking about purchasing and Bach 36bo, lots of a helpful information on here.

Doug_Elliott · by **Doug_Elliott** » 2024-03-27 10:18 p.m.

Sounds like it's an 11 (rim & cup) with an F throat (.257) and backbore #413.

Bach backbore numbers don't mean anything except their own tool number for the reamer. I don't remember but I think 413 was a standard backbore for some of their mouthpieces.

Posaunus · by **Posaunus** » 2024-03-27 10:30 p.m.

I bet Doug is right.

This sounds like a special-order smaller-cup version of a Bach 6½AM [Cup I.D. = 1.00"; Throat = 0.257" (F); Backbore #413].

Cup I.D of a standard Bach 11 is nominally 0.972" [but I have one that measures 0.992"! No one ever said that Bach was consistent.]

Euphman06 · by **Euphman06** » 2024-03-28 11:06 a.m.

Thanks!

baileyman · by **baileyman** » 2024-03-29 2:56 p.m.

"F" would seem to b a standard index drill bit size.

Doug_Elliott · by **Doug_Elliott** » 2024-03-29 3:30 p.m.

But considerably larger than standard size for an 11

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Bach Mt Vernon 11 with stamps