Thank you for your responses.
I went to go look at it, and well, that was an interesting experience. The body looked very clean, lens looked clean (although there were shiny areas on the diaphragm blades, like mechanical rub marks, maybe normal?). Elderly man in wheelchair wathces me while I'm closely inspecting the camera... says he's had it about 12 years and only ran one roll of film through it... I ask if he has a battery so that I can test the meter... he says "meter...??" I also ask why there's a large amount of grease along the bottom edge of the body... he takes the camera from me and say's "you're too meticulous... I think you're just looking, not going to buy it... you're too young and don't have money..."
I'm pushing 44 and quite interested in getting an RF, but this gentleman has somehow been able to ascertain that I'm still a babe in the woods with no means! I bid him goodbye and walked out. No M6 for me today...
Dale