Penn Los Angeles is a lesser known brand of vintage mouthpieces and there is not much information about them. They appear to be a later American stencil mouthpiece that was made from the same blanks as Dukoff-Zimberoff and Brilhart Hard Rubber mouthpieces were made from. The research I’ve done suggests that the company may be associated with the Coast brand and that the Penn mouthpieces may have been a higher student line mouthpiece. Good vintage hard rubber like this always can be a great mouthpiece for a refacer to work on, especially considering the same blanks were used to make some of the best historical hard rubber mouthpieces!
This one is in really nice condition in a .044″ tip opening.