This may be a duplicate post. The first one didn't seem to work.

I purchased my Spot in the mid-to-late 1960s. Under the same conditions you used, at shutter speed 1/60 sec I get a reading of ~40K. At speed set to B, I get a reading of ~25.5K. So the resistances are reasonably close to your oldest camera. I've tried several silver oxide 1.5v batteries and the meter needle refuses to deflect. This camera has been in my closet for about 8 years so maybe the circuitry is fine but the needle movement is corroded. I'll see if a camera shop can fix it for a reasonable price. Thanks very much for your help.