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The 16710 was produced from 1989.
The proposed model is a 1991 N series with a Superluminova replacement dial "SWISS MADE".
The caliber used is 3185, based on the 3135 caliber that was used for the Submariner Date, Datejust, Sea-Dweller and Yacht-Master.
Launched in 1985, the 3185 caliber was the first movement to allow the GMT hand to be configured independently of the current time by the crown. It allows a semi fast date change.
It is certified COSC : The official offices of the COSC (Swiss Official Control of Chronometers) were founded in 1973 in La Chaux-de-Fonds. It is an independent organization that guarantees the Swiss manufacturing tradition of precision.
The sapphire crystal is scratch-resistant and the 6 mm diameter Twinlock ring provides double protection against water and dust infiltration.
The bracelet, reference 78730 - 558B is original.