Thanks for sharing your vintage U-N’s but please be careful about regular wearing. I share my 1958 U-N here, which radiates at about 0.9 µSv/hr and mine's original dial has no “parking marks” and is safe to wear a few days at a time, which I do.
I have a vintage 1957 G-P Gyromatic that looks fabulous and quite subdued with no “parking marks” but nevertheless radiates at about 15 µSv/hr. That G-P lives in a lead-lined box and is worn infrequently no longer than two hours per day!
With a half-life of 1,600 years, radium will be around our watches for a long time unless removed!
Clive