Anyone know anything about mechanical watchman's clocks? This one is a Chicago Watchclock Corp 8 day clock. I don't have any station keys or a key to the back, so I can't open it up. It was in my grandfathers possession & I have had it for yrs now since his passing. It should date back to the Great Depression as the family story is he had to take a job as a watchman then. How hard is it to come up with keys? If I had it cleaned & serviced will it function as an 8 day clock? I have no idea what kind of paper disc or tape might be inside. I've just started my research. There is an old time clock repair shop where I live. I plan seeing him about it soon.