There is no switch on the K1000, if you forget to cap the lens the meter will kill the battery.
Well made camera. Thats a heck of a deal and good work on your part. That body looks pretty cherry. No wear marks.
Good coated optics on that lens. Is that a screw mount lens?
Somewhere I’ve still got an old Canon Ftb (not an FtbN) in my storage. 1.4 50mm Canon lens. Last I checked, about 5-7 yrs ago it was still working. I took the battery out before I stored it so I’m not sure about the metering. But the shutter, mirror lock-up, depth of field lever and timer were all O.K. Built like a bank vault. Black body model.