Vintage King Crown 7M Trumpet Mouthpiece From Old Musical Instrument Shop

Description

Vintage King Crown 7M Trumpet Mouthpiece From Old Musical Instrument Shop.
I believe it is brass under the silver plate but not certain. Heavily tarnished but the King with the Crown logo and the 7M are visible.
I got this from an elderly trumpet player who also had an uncle who ran a musical instrument repair shop for decades in New York. This mouthpiece is from this large lot. Due to the amount of years these mouthpieces span I can’t say what era these mouthpieces are from. Look for other mouthpiece and instrument listings - I will be posting many more from this lot.