About twenty years ago I was in NYC and walked into one of the may used photo equipment stores there with my OM2n. I told the guy I was looking for spot meter capability and asked if he had a OM2000. He snorted derisively and said, "You don't want an OM2000, here's what you want." as he handed me a gently worn OM4. The price wasn't bad and I bought it on the spot. Ironically, that OM4 was in for repairs more than any other of my Oly's (ongoing problems with the film advance), and while I still have it, it was replaced long ago with an OM4T as the go everywhere camera.
In retrospect I'm fairly certain the guy just didn't have an OM2000.