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Here is what the nice guy at Blancpain vintage department said in answer to this question: "The no-rad sign which appears on your watch should be an indicator of the use of Tritium instead of Radium. Our attached analysis reports clearly show, however, that Radium has been used on some of the lumino

Maybe radium was not considered to be as heavily radioactive as the substances used in the Milspec watches (e.g. Promethium 147)? I wonder how a dive watch in the 1960s could be luminous without using some kind of radioactive element on its dial...?

... to mess about with the dial, Tom. The nice people in the store mentioned that there aren't many of these "no rads" 1960s Blancpains around, and that the company had to appeal to collectors to get some together for an international show they held a while back (along with all the other old Blancpa

Maybe radium was not considered to be as heavily radioactive as the substances used in the Milspec watches (e.g. Promethium 147)? I wonder how a dive watch in the 1960s could be luminous without using some kind of radioactive element on its dial...?

Here's the info leaflet that came with the watch. I notice the picture of the watch on the leaflet does not match the actual watch (absence of "no radiations" marking, etc). Sean This message has been edited by Sean100 on 2015-11-28 05:54:05

Hi everyone Although I've owned a Blancpain for a while, I don't really know much about them. If any of you have a moment, I'm interested in reading your advice about who should service my watch, and what I should ask them to do: I inherited a 1960s civilian No Radiations Fifty Fathoms some years ag