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Hi,
I have a Conn L tuba mouthpiece with a 30mm inner diameter. Does anyone know what instrument or purpose Conn intended this for?

I never thought of asking, but I believe it was Mike Finn who posted page 19 from an old Conn catalogue to show the source of his new H mouthpiece. On this catalogue page I saw a conn LTD or D on the mouthpiece, but no L. I was just curious. The Conn L is a shallow funnel with a 30mm diameter inner rim. Perhaps it comes from another page of the same catalogue or from a different time period, or it might be for a euphonium. William.

Sounds to me like the predecessor of the 7B.

Conn used "L" and "S" designations whenever two mouthpieces were supplied as part of the kit, i.e. a mellophpone which went from F/Eb/D/C. I have also heard of them using the designation for throat size ala Bach. How either of those fit in here is another question...

Thank you for the information. William.