I have some watches that were my grandfather's, and I'm especially interested in this 1906 (based on the serial #) Waltham in the gold-filled case. He worked for Chicago Surface Lines (A predecessor of CTA/Chicago Transit Authority) as a street car driver (motorman). It appears to be a size 9 if I measured correctly (edge to edge across the movement). I can't find the style name anywhere, however, or the number of jewels in the movement. The crystal is missing (my fault). I've seen this style of roman numerals associated with railroad watches, and since he worked for CSL, I wonder if perhaps he got it through work. I have two others from him (shown at the bottom of the page): Another, larger Waltham in a silver case, and an Elgin that also looks to be around a size 9, in a silver case. I think this Waltham has by far the nicest looking face of the three, however (yes, that is a series of hairline cracks you see in the whte enamel). Don't know anything about the other two watches, they seem to have twist-off backs, but I can't get them to budge. None of the three are operational.
I'd like to know the model, if anyone can help.
This is the inside back cover. I've copied the smaller engraved markings seen here on the inside of the back, and flipped them right-side-up for ease in reading, and added what I'm pretty sure are the correct notations next to them. Other photos of the few case backs I've seen don't usually have all this information, and I have no idea what it all means, unless they might be records of different parts used in the movement?
I did find out courtesy of Google, that SWC is the case maker Star Watch Case Co. As you can see, the case serial number is 1641902.
The serial number on the movement is just above the superimposed serial number.
The other two watches (no crystal on the American):
Is it possible to obtain an original crystal for the 1906 Waltham? It was quite thin, and I'd guess that any new replacement wouldn't be quite as nice.
Thanks for any help you can provide!