I've become interested in the clarinet again. I dug through the closet and found the clarinet my father played in the late 40s and early 50s. I played it from 3rd to 12th grade, through 1980. My son played it in middle school (through about 2000) before switching to the violin.
It's just a plain-jane Leblanc Normandy model. From any measure except sentimentality, it's not remarkable. That being said, 60 years later, it still plays pretty darned well!
As you can see, the keys are tarnished. I am not sure there's any plating left to polish.