Sometimes it is an interesting thing with old cameras. I have a Pentax Honeywell H1a, the US version of the Pentax S1a. Back in its time it was a budget version of the SV, no timer and shutter stops at 1/500 instead of going to 1/1000 second. As far as I know my H1a has never been opened up, I know it hasn't since I have owned it. Although my SV looks absolutely pristine, the innards will reliably come to a stop whenever the temperature drops around 0F, refusing to take another picture until I take it somewhere warm. It must have grown up in Southern California.
On the other hand, my H1a looks like a refuge from a war zone, but it will just keep merrily clicking away, no matter what the temperature, at least as far as I have found. I suspect it is a Montana camera.
Basically both cameras have the same mechanisms, but they certainly react quite differently to temperature drops.
Just goes to show, you never can tell.