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IWC Ingenieur*** IW3540 Perpetual Calendar*** 1987
OUR ARCHIVE » IWC Ingenieur*** IW3540 Perpetual Calendar*** 1987
IWC Ingenieur SL Perpetual Calendar, 18K Yellow Gold
Serial: 2388976/2408199
Circa: 1987
Reference No.: IW3540

CASE: 35mm, 18K Yellow Gold, Screw bezel, Hinge Lugs, Sapphire crystal, Screw Crown

DIAL: White dial with 3 registers, moon phase and year indicator window.

MOVEMENT: Caliber 35782, automatic, 37 jewels

BRACELET: Leather strap with IWC 18K yellow gold buckle

CONDITION REPORT: Excellent overall condition, sharp case.

NOTES: Watch Only

This IWC Ingenieur Perpetual Calendar Ref. IW3540 was launched in 1987 under the helm of Günter Blümlein, IWC's CEO at the time. Head watchmaker Kurt Klaus developed a new type of mechanically programmed perpetual calendar module was conceived with just 82 components. It was fitted on an ETA 2892A2. For the first time in a perpetual calendar, all adjustments – from the four-digit year to the moon phase – could be handled via the three o'clock screw-down crown. IWC added in something called the "century slide" which advances once every hundred years. It remained in production until the early 2000's with its hinge lugs and screw down crown remains an iconic design of IWC from the 1980's.

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