Louis Erard 1931 Regulator Power Reserve
Regulators first appeared at the end of the 17th century, in the field of chronometry.
Movement is the hand-wind ETA caliber Peseux 7001 RE with Regulator and Power Reserve complications developed jointly by Louis Erard & Soprod SA.
The case, in satin-finished/polished steel or black sand-blasted PVD, measures 42mm. It has an AR coated sapphire crystal, display back, and is water resistant to 50 meters.
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