Doxa watch serial numbers9/1/2023 ![]() ![]() It is not something to worry about very much so long as you do not disturb it and you keep it away from children. That would be a mixture of radium and zinc sulfide and even though is would not glow today, the radium would still be close to full strength since the half-life is around 1,600 years. The numbers on this one, and the hands as well, seem to have a luminous material on them which is the reason why the dial is black - so the numbers are more easily readable at night. Many military watches of WW1 had white dials also and conversely many civilian dials are found in black. The black dial (now faded to a brownish color?) is not indicative of military use. I have a 1940s civilian wristwatch with a dial that is very similar for example. The dial seems to be more late teens to 1940s in style - it is hard to tell as this general style civilian dial was used for so many years. The overall style of the movement and the case do appear to be from the 1915 to 1920s range though. Doxa was not putting serial numbers on their movements at that time so dating such movements accurately is not possible so far as I know. ![]() The serial number of the case often is different from the serial number of the movement so going by that alone for a date is a bit soft. ![]()
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