I just got back from the watchmakers who gave my recently acquired Thomas Russell Son wristwatch a CLA, now it's ticking away merrily. When I got it the crystal was broken with a couple of gaps at the edges, the crown has its boss for the stem knocked to one side; a new Robur crystal has been installed and the leaning boss in the crown straightened out a fair bit, but he is looking for a replacement crown.
It's my understanding that Thomas Russell's pocket watches are much more commonly found than their wristwatches; mine has a Swiss movement in a Dennison case measuring 30mm in diameter with 16mm lugs; obviously much later than their pocket watches. It has a white dial, with lume hands and Arabic numerals on the dial. The brownish lume is gone from the minute hand, and some of it has gone from the numerals.
I do not know if the lume material contains radium, I do not have the instrument for radiation detection, but it would be nice to find out. I am thinking: what if I put the watch and a some sensitive material, such as a piece of photographic film or paper in a sealed, light-tight canister, and after a while develop it?