From what I've researched, it has the import mark for Glasgow, and the 9k gold hallmark is easy enough. It has what I assume is a "makers" mark (which looks kinda like Mappin and Webb), but I'm not sure what that actually means in conjunction with the import hallmark...is that the mark of the importer, or the original maker? Finally, there's the date code. The closest I can find for that from Glasgow is 1938, but that doesn't line up with the age of the watch (1916) or the style of the case (fairly classic trench watch design typical of just after WWI). And of course, the box is wrong. From this, I'm kinda assuming that the date codes for "import" items were different.
Finally, there's the "A5M" mark on the top. The punch looks similar in style to the hallmarks (as opposed to the engraved serial number), so I thought that might indicate the country of origin? Or am I just being hopeful?
Additional information if you're curious; the watch movement was made in 1913 and sold to "E.H.Newman and Sons", a jewelery store in Brantford Ontario in 1916. It was likley resold as a "house brand" watch. The case was probably sourced seperately.
Here's the whole watch:
And the inside dustcover:
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