Reynolds-Pottag 6D French Horn Mouthpiece
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From a vintage Reynolds brochure:
Pottag French Horn Mouthpieces ... especially designed for professional and student use.
6A - Designed for beginning student
6B - Constructed for average player and advanced student
6C - A mouthpiece for professional players
6D - Strictly a professional mouthpiece with narrow rim and deep cup.
My measurements of the 6D cup are a #15 bore and about a 17.00mm inner diameter rim. The rim has a very rounded thin feel with a peak in the middle. Rounded and flat outer edge. Anyone with more information please contact me via email. Scott@SiegfriedsCall.com Please add vintage 6D info to the subject line.