SHASTOCK CUP MUTE

VINTAGE MUTE

Here's an example from around the 1950's to 1960's. 
All original condition (has original faded sticker, paint and even the original owners name on a sticker on the inner cup). 
I have not touched any of these elements to preserve the authenticity. It was previously owned by a top tier Canadian professional musician who retired.

Shastock Cup mutes are widely used in Band, Studio and Commercial applications. 
The adjustable aluminium cup makes this an extremely versatile mute which is why they remain popular today