Here's a good original 1960s/70s era Bach 7C mouthpiece that will fit any standard cornet. It is stamped with "VINCENT BACH CORP. 7C" in small lettering. You will get the exact mouthpiece that is pictured.
Vincent Bach Corp. MT. Vernon New York 7 trumpet mouthpiece (used
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VINTAGE 1960S VINCENT BACH CORP MT VERNON NEW YORK 7CW TRUMPET