133.8 from 1953
Last edited by OttoH; September 21st, 2015 at 11:07.
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You are correct - you have the Cal. 4010 which is now also found in the Pilot Big Date.
The large date feature towards the 6:00 was originally developed for the rattrapante El Primero (Cal. 4026). Like many other things, Zenith wisely decided it was wasted if only used in this movement (rattrapantes are very expensive so the output is small) and brought out a non-rattrapante version which they designated Cal. 4010. No, yours is not a rattrapante, despite the common grande date feature, I'm afraid.
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