Warburton Top Bob Birch Silver Plated
Warburton Bob Birch signature trumpet mouthpiece top, silver plated. Personal top of Bob Birch. Inside diameter 0.680", outside diameter 1.090", medium-deep bowl, bore size #23. This is similar to our 2MD, but with more girth at the bottom of the cup and a more pronounced inside bite.
|Cup Depth||Medium Deep|
|Cup Diameter||17,72 mm|