Duesenberg Chronograph on Ebay

As in Russian MIG?

Yes.

For those converting these in the future, find a good way to dispose of the dial and hands. The amount of radioactivity coming off that is insane. Possibly a lifetime of radiation in one year if you park yourself next to it all day. The rest of the case and movement should be fine. I had a Navy ships clock for 30 years and only recently saw someone on-line put a geiger-muller tube up to it. Luckily I was never near it except weekly to wind it.  It's much more than a standard '30s wristwatch which has very small dots around the dial.

Interesting.  Didn't seem to affect my dad as he lived to 97 and started that project in his 60s.    Where is the radiation coming from?

AJ, the off white paint on the hands and numbers (2, 4, 8, 10 on the MIG version above). It's radium so it would originally glow in the dark. The glowing aspect fails after 5-10 years but the radioactivity remains. The half life is 1600 years.  It's not really a problem unless you constantly inhale the dust when working on multiple ones, or unless you sleep with it under a pillow....

After looking at this awhile I have one more detail: Jager LeCoultre did make these for Russia initially. However just before WWII the First State Watch Factory in the USSR began to make their own. Their case housing is different and plates are different. Some parts swap but not all. Importantly the balance is not temperature compensated like the original version and I would think it would be a bit difficult to get running with good accuracy. So, in my opinion, it is best to find a Swiss unit if doing a conversion.
   Interestingly, LeCoultre continued production up to about 1990 and their updated caliber went into Boeing 707, 727 and 737s so we can at least consider the design reliable for sure.

Thanks Dan!   Wow.  What you are saying about the radiation makes complete sense now.

Or if you put the paintbrush in your mouth. Oh the things they did before the OSHA days.

https://www.britannica.com/story/radium-girls-the-women-who-fought-for-their-lives-in-a-killer-workplace

I prefer the later swept needle instruments.  Easier to read.  But the Chronograph is identical either way.