Thanks for the replies.
I don’t have specific information about previous hours used or storage time - I need to ask better questions. I bought it on a whim second hand from a member here. I spent a good amount of time installing the cartridge and getting it set up correctly. The one piece of data I’m missing is on the recommended overhang.
I just listened to side one of my 2010 Columbia reissue of Kind of Blue and it sounded very good. That was the 5th album side I’ve played since installing it. I know the million dollar question is whether my ears are adjusting or if the sound is actually changing.
Thanks again for the replies.