The watch was bought from A. McMillan in Ottawa some time around 1915 to 1925. The diameter of the base plate, as normally measured, is 24.5mm with the dial inset into a wider surrounding step up diameter of 25.3mm. This would seem to indicate a 6/0 movement commissioned by the jeweller as the movement is imported from Switzerland. The only markings are "swiss" and "15 jewel" but no other identifying marks, numbers or symbols. It seems high quality as it also has a breguet hairspring. The keyless works look different to any of the mainstream movements of that time that I have seen I need to track down an escape wheel and centre wheel to restore it, so any help would be really appreciated.