I’m starting a new job at a high school and I’m doing inventory of the instruments we have in the closet. I come across a very vintage looking bass clarinet case, and inside is a one piece bass clarinet with all the necessary parts. The problem is that the serial number only has four digits (5544) and there is no brand name, only a US patent number near the bottom (2775915). I looked up the patent and it seems like it was held by Selmer, I can’t seem to find any bass clarinet with a similar serial number by them. any and all help is much appreciated!