Sub transitional model 16800 of 1980 vintage.
Just got this back from the agents after a scare:  it was overhauled 2 years ago at huge cost, and I've only worn it a few times since.  Two weeks ago I took it out and wound it......only to find that the mainspring was bust!  Inexplicable...Anyway, the good news is that it was repaired free of charge. A $400 saving!

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