I did some research on this watch from a watch book that helps me some. The movement number is 13154167, says A.W. Co. Waltham, Mass. This watch ticks and runs, I suggest whoever purchases it have it cleaned and serviced.
Someone told me that if watches sit, they need to be oiled...this comes from my late fathers estate. He was a watch/clock repairman so I have alot of watches, old clocks, lots of tools.
The face of the watch says Waltham, the back screws off and says Illinois Watch Case Co. Spartan and has 0685860 as a number on this lid. This is 17 jewels.
I don't know how to measure this watch. Don't know anything about watches so limited to answering questions but I'll try.
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Buyer agrees to purchase "AS IS". I'm listing this item based on what I see. If you have questions, please feel free to write me.