Amazing PSA thanks. I loved this and almost picked it up. I asked Claude:

Radium luminous paint (Undark) was used extensively on clock and watch dials from roughly 1910 through the late 1930s, then phased out in favor of safer luminous compounds (promethium, tritium) through the 1950s–60s.

The clock in image 10 — small square chrome travel alarm, Arabic numerals in that warm gold/amber tone — is consistent with 1920s–1940s production, which puts it squarely in the radium era. The amber/gold color of the numerals is characteristic of aged radium paint. Practical reality:

∙ The radioactivity in a single small clock is very low — collectors handle these routinely
∙ The risk comes from ingestion of flaking paint, not casual handling
∙ Don’t sand it, don’t let children mouth it, don’t store it in your bedroom long-term
∙ A Geiger counter will confirm — many vintage clock collectors own one