Horn Mouthpiece MEISTER HOYER 2 Hans Hoyer

There are minor scratches, but it has been used infrequently and is in beautiful condition.
It is an American shank.
While specific size information is not available, it appears to have an inner diameter of approximately 17mm and a slightly rounded V-cup.

The following are for reference:

https://www.hiiron.com/%E3%83%9B%E3%83%AB%E3%83%B3%E3%83%9E%E3%82%A6%E3%82%B9%E3%83%94%E3%83%BC%E3%82%B9%E3%83%AC%E3%83%B3%E3%82%BF%E3%83%AB/%E5%95%86%E5%93%81%E3%83%AA%E3%82%B9%E3%83%88%E8%A1%A8-1/hans-hoyer/

https://paypayfleamarket.yahoo.co.jp/item/c1051942010