IWC Schaffhausen GST Perpetual Calendar Ref. 3756

Introduced in 2001, the GST Perpetual Calendar from IWC is mechanically programmed until the year 2499. The Patent for this special programming mechanism is held by IWC Schaffhausen.

This eternal timepiece not only handles current and future time but also comes with the most popular additional function of the age: a classical mechanical chronograph that provides aggregate timing of any period between one eighth of a second and 12 hours.

IWC Schaffhausen GST Perpetual Calendar Ref. 3756

The small, internal dials show the correct day, date, moon phase and the complete four-digit year in the window at 8 p.m., where the century slide with the first two figures of the year can also be found, waiting its turn for action. And it’s a long wait: the next time it moves will be at the end of the year 2099. At that point, the “21” for the next century will slide noiselessly into position. A reserve slide with the numbers 22-24 is supplied in a tiny, sealed glass vial inside the watch.

In IWC’s eyes, a perfectly mechanical program is one in which the calendar is powered and controlled completely independently by the main automatic movement and where the extra day in leap years is likewise handled without any intervention from the owner. Needless to say, this also applies to the phase of the moon display, one of the most accurate in existence. After 122 years in action, it will be just one day out, and the necessary tiny adjustment can be made by a watchmaker.

IWC Schaffhausen GST Perpetual Calendar Ref. 3756

All calendar functions can be adjusted using the (screw-in) crown. This exclusive IWC feature requires no push buttons or pins and, like the four-digit year display, is protected by patent. The calendar must not be adjusted between 8 pm and 2 am and must never be turned back. Any owner who puts the calendar forward has two options: to wait until time catches up with the watch or to send it in to Schaffhausen.

The GST Perpetual Calendar, Ref. 3756, is available in a choice of two materials with three different dials.

The GST Perpetual Calendar in titanium, it comes with the patented, integrated bracelet concept found throughout the GST line; this requires no screws and can be shortened or lengthened easily by the wearer. It is held together by the high-security push-button clasp. The titanium model comes with a black dial featuring special high-contrast white hands and indices, all luminous.

IWC Schaffhausen GST Perpetual Calendar Ref. 3756

The GST Perpetual Calendar in stainless steel is available either with a discreet, light rhodium plated dial and rhodium-plated hands and indices or with a dial in that classic warm colour for high-quality watch dials, saumon, likewise with rhodium-plated hands and indices. Both watches are fitted with the integrated GST steel bracelet.

Both models have non-reflecting, convex sapphire glasses for a clear view of the dial at all times together with ornate engraving on the back. They are both water-resistant to 120 m.

Technical details

Model: IWC Schaffhausen GST Perpetual Calendar Ref. 3756

Movement: Mechanical, automatically-wound
Functions: Hours, minutes, small seconds, chronograph, perpetual calendar (4 counters for the day, date, month and moon phase, window for four-digit year)
Case: Steel or titanium, screw-down back and crown
Antiglare sapphire crystal
Water-resistant to 120 m
Dial: Rhodium-plated or salmon (steel model),black (titanium model)
Bracelet/Strap: steel or titanium, pushbutton with security system

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