Canuck
·Inherited this Omega. I try to learn more about it. I looked up the serial number but the lists I found varied somewhat in the date, but 1910-1914? Can that be correct? Also, can anyone tell me something abot the movement?
The movement looks like a 15-Jewel model 19L as seen in the Ranfft archive. Your idea of age appears to be very close.
The case is Swiss made. The stamp .935 refers to the fine silver content in the case alloy of 93.5 % pure. This grade of silver was compounded specifically for silver items exported to Great Britain (and possibly other locales.) You can read more the Swiss case marks here. Specifically, scroll down the the section devoted to .935 silver.
The disc converting the dial to 24-hours was an after market add on.
https://www.vintagewatchstraps.com/swisshallmarks.php