So I’ve moved this to its own thread, since it’s not directly related to the ebay listings thread.
Watchmakers who specialize in vintage pieces can often stabilize lume if its become flakey / rough which preserves the original lume in place by applying some material behind the hands.
When the lume has fallen out what they do is mix up some tritium lume substitute that isn’t radioactive but may or may not glow depending on preference. They can then color match that to the rest of the lume or the lume on the dial, and re-do the hands. Re-lumeing hands, especially thin ones like on those Seamasters tends to come out looking very good, it’s not like re-lumeing dials which is a lot more difficult to get right. I’ve had a lot of them stabilized or relumed with tritium colored substitute and it’s a cost effective way of getting the watch looking tip-top again.