Okay, so you might find this interesting. You're right about it being inter-war. I know that my great aunt gifted it to her husband in 1937 (and as you can see from the wear on the back, he apparently wore it pretty constantly until his death in 1987). There is no serial number between the lugs on the watch. When I pull it out of the case, it looks pretty. The inside back of the case has a number, but 51177 doesn't seem to match up with the site you linked to. Then, when holding it in the light, you see another number, scarcely discernible. Looks like N1925, but that doesn't get me anywhere, either. A few numbers appear to have been scratched in there, actually (none of which are easily distinguishable). Edit: Of course the date on the inscription may not have been the year Phyllis actually gave Charl the watch. 51777 puts it bang in 1938, and she might have given it to commemorate their first year anniversary or similar. That would make perfect sense. Thanks for your help. Edit 2: It actually looks remarkably like this one circa 1930 (albeit much more loved).