What changed in the Tritium lume from the long to short indices?

M'Bob · Mar 14, 2023

It seems that over the years, most of the early ref. 145.022 I’ve seen, especially ‘69, rarely seem to have that attractive, beige or yellow dial luminous often seen on the immediate predecessors with long indices.

Often, this has been chalked up to wear or washing of the dial, but it seems that even in decent examples, the dial luminous is always white, or very close to it. Here are two ref. - 69:

Admittedly, not a huge sample size, thus the question: has anyone else noticed this as well?

eugeneandresson · Mar 14, 2023

I have noticed how lume color is period specific (with Speedmasters). Which says a lot…also posted a thread which you likely saw.

End of the -69s appears to more or less be the switch to mint green coloring.

Here is a nice creamy 69.