It doesn't have any radium in it; they just call it "old radium" to denote the color. And probably to evoke some nostalgia for the "good ol' days" when watches were watches and young women died because of it.
My 9th grade science teacher had a radium dial watch and he would bring it in to make the geiger counter go crazy. I don't remember anything fancy about the lume. Funny, Coleman lantern mantles also make the geiger counter go crazy.
wikipedia info on SuperLuminova:
https://en.wikipedia.org/wiki/Super-LumiNova
A more in-depth and colorful description: Color coded coolness:
There are a variety of lume pigments available. As you can see in the lumeshot comparison above, microbrand Marc & Sons went with a bluish lume for their pilot watch and a green lume for their diver. Most watches with Super-LumiNova will use one or more of the following color codes:
C1 – White with about 31% brightness of C3
C3 – Yellow with the brightest glow
C5 – Greenish-yellow with 89% brightness
C7 – Green with 84% brightness
C9 – Bluish-green with about 83% brightness
BGW9 – Light bluish-white with about 95% glow of C3
Old Radium – Appears to be aged/vintage tritium lume in the daytime, but glows a bright yellowish-green at night
Old White – Off-white color in the day, glows yellowish-green at night
https://www.3watches.com/all-about-super-luminova/
Vaer uses old radium SuperLuminova on some of their watches and provides a picture for us as well as a nice description:
"Old Radium Paint: While the name is confusing - Old Radium paint is NOT radioactive, and in fact contains no actual radium. It’s simply a tan tinted version of C3 SuperLuminova, that’s mixed with yellow/gold paint to achieve a vintage aesthetic. The reason that it’s called Old Radium is that many vintage time pieces that used radium paint in the 1950s, 1960s and 70s tend to have a consistent patina in which the original white lume paint yellows or “tans” over time. Modern watches the like the Vaer Tradition and Korean Field use Old Radium lume to honor this popular retro aesthetic. While Old Radium is a strong lume paint, it is not as strong as C3 or BGW9 lume, as it is diluted with coloring."
Super-LumiNova comes in three grades: Standard, Grade A, and Grade X1.
Standard Grade is the least expensive and has the shortest afterglow time.
Grade A has a longer afterglow time than Standard Grade.
Grade X1 is the most expensive and has the longest afterglow time.
Lume grade is not the end-all-be-all marker for performance. For example, a lower grade lume with more layering can outperform a higher grade lume with less layering. Also, a lower grade lume of a better compound can outperform a higher grade lume of a lesser compound (eg. C3 of any grade will outperform even X1 Grade C1).
https://www.vaerwatches.com/blogs/journ ... in-watches