I believe the first one is a franken. If the day / date window has a divider like the second watch has it's a caliber 102x inside. If there's no day / date divider it should have a 75x inside. The chronometer versions have a 1 at the end, so the first watch should have a 751 - but it has a 1021. It's possible it came like that but highly doubtful. The serial number puts it at 1972, one of the earliest of the 102x series and jives with the dial layout for the wording, but I still think it's incorrect.
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