Grrr, it is as I thought it might be (but due to a death wish, didn't want to ask beforehand): the meter registers current but does not read. There was a receipt from a camera place about that very thing, the guy'd got an estimate for the repair. I'll ask him...
But not the end of the world, the camera itself is in good shape though dirty, and it came with a SMC 55/1.8 in great shape + a holster case to hold a long lens. Getting the meter fixed (unless I can dig up something I can possibly attempt) will be expensive though.
And the OM2s uses the same batteries, two at a time, so they aren't a loss either