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Hi
I will enclose you a pic of the rolex 4130
It is the largest selfwinding column wheel chrono movement 30.5 mm of diameter and 6.5 mm of height as compared to 6.85 mm of height and 27 mm of diameter for the 33xx and 6.5mm of height and 30mm of diameter for the zenith el primero 400 series and 7.55mm of height and 30 mm of diameter for the el primero 4001-4009 series.
It was also built to be simpler to service than the 4030 introduced in 1988 pic enclosed here
Thee 4130 priviledges the ruggedness of components, ease to service the watch, biggest power reserve available and micro stella techonology.The 4130 is far better than an el primero.
Hope this helps
regards
georges
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