Historically Radium was applied to various metallic compounds which resulted in different glow colors. Perhaps Breitling can provide information of their original lume process and the color might be an indicator. Thermo Fisher manufactures radiation detectors that are isotope identifiers now used to screen for radioactive materials at airports, border crossings, and ports. Someone might be interested is doing a cursory screening of your watch as a test of their equipment. If it was a complete re-lume with 3H, a simple radiation detector will tell you whether beta particles (from 3H) are being emitted or gamma rays (from 226Ra) by placing a piece of aluminum foil between the watch and detector. Beta particles will not pass through, gamma rays will.
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