1951, 1953, 1953, 1954, 1954, 1956

That is when they were produced as a movement, which could be cased later.

I tend to agree with the above post. Also no indication of SWISS or T on the original post on the watch dial?

You can never say never with the Swiss, but 424 normally has no date function.
I can't say I've seen that case either!

Several manufacturers made that style of watch in the 1930s. I don't think you'll find much more information on it.

Something doesn't add up here. The case is 200k and the movement is 26k?

Usually, the movement number is HIGHER than the case number.

SWISS T would indicate tritium, which wasn't commonly used until the 1960s.

So no, it would not be original to the watch.

I don't have any specific information on that model, sorry.

Looks like a nice example with matching numbers.

Looks like an early Liscica powered Reverso. Probably circa 1932/33.

No normal parts house will have these. Let me see what I have, I may have some cal 412 parts.

Do you have a photo of the existing center wheel?