Welcome
@AaronLynch - it's an absolute pleasure to read such a well thought out introduction. I wish mine had been as good.
I'm not going to comment on the watch you've offered up as it's outside my area of knowledge. What I will ask instead is:
1) where and in what branch of the services did your grandfather serve?
2) was the watch white faced?
3) can you possibly recall if there was a subdial at the 6 o clock position (a subsidiary seconds)?
4) do you know if the watch was issued to him or if he simply bought it while in the services?
Depending on your answers, we might be able to narrow down your search significantly.
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