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I've lost count of the number of different tang stamps I've seen on them. Maybe as many as 5? I suppose that's to be expected considering they were selling them for 60+ years.

Personally, I have a...

Yeah. I'm not clear on the dates or all the details.

My guess is that the screw & screwdriver is from before the 1890's (they go back to the 1840's) and the thumbscrew is after, but that's just a...

For the screwdriver or the mystery tool?

The later models had a thumbscrew knurled like a watch crown, no screwdriver required!

I've seen a lot of Le Coultre kits and I've never seen one of those tools.