Aero Compax Ref 22289 / SN 1072......Original Dial Debate! Opinions Needed

I very much doubt that any of the devises here will be able to measure tritium. It’s energy is to low to pass much through the steel and glass of a watch.

From Wikipedia:

Tritium is a naturally occurring radioactive form of hydrogen that is produced in the atmosphere when cosmic rays collide with air molecules. ... Tritium emits a weak form of radiation, a low-energy beta particle similar to an electron. The tritium radiation does not travel very far in air and cannot penetrate the skin.

If I can just lend a story on “expert opinions”:
My parents were avid art collectors. They traveled the world for business and would collect what they liked and could afford- which were usually signed prints, original artist’s sketches and litho’s. Back in the 70’s the art market was different than it is now- there were bargains if you had a keen eye for modernism.
I grew playing in rooms with Picasso, Kilmt, Seargent, Nagel, Chagall, lots of Lalique glass and pre-Columbia’s artifacts around which I had to be careful when throwing balls around the house.

After my parents divorced they split the art based on their taste- they ammicably bought each-other out of the collections. When my mother and step-father moved to the east coast, they had the collection re-appraised for insurance. This collection had been appraised in Los Angeles by at least 3 different appraisers for insurance purposes over the years and all verified as authentic. My step-father brought in the new appraiser and one piece he questioned was a Chagall hand colored print- saying that he wasn’t familiar with the piece, nor was it referenced in any of his catalogs- so it must be a fake. My step-father being a blow-hard, easily jumping to conclusions, and having a bit of animosity towards my father (who originally acquired the Chagall) immediately sided with this appraiser and cried fake. My mother asked for a second opinion but my blow-hard step-father said no need!! -an expert had given his opinion.
They gave me the Chagall considering it was worthless so would make good wall decor in my apartment while I was in college. 20 years later I had an art conservator over for dinner and immedialty upon walking into my living room saw the print from across the room and said “oh, you have a Chagal!”. I told her the story, she laughed and blurted out “that guy didn’t know shit”. She spent the next 10 minutes talking about the piece, the symbolism in it, and the period in Chagal’s life when he made it.
Always get multiple opinions and reserve judgement until there is a consensus from multiple sources- nobody can be an expert of everything and there are always variations that you may have not seen.