That's what you want to see, the RG regulator.
Movement has nice matching metal pieces and
looks very nice (as in kept a good seal)
I don't see any circular scratching on the caseback
or the rotor so the rotor looks to be in good shape
and the movement probably not too worn.
121 serial is right in the correct range for these Chronometers.
It's a beautiful piece. Enoy, these are special, mate.
You should be able to regulate this watch to within a few
seconds a day.
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