Henton Vintage Hard Rubber Alto Mouthpiece #1 P with ligature and cap
This mouthpiece looks a lot like a vintage Conn Steel-Lay or a Naujoks-McLaughlin with a different name on it. Store branding was as common in this era as it is today and this was likely made for Henton?
It has a short shank and metal table rails and tip fused onto the rubber. There is a large chip at the tip of the mouthpiece so it will need a fairly large amount of work to play.