IWC Schaffhausen GST Perpetual Calendar Ref. IW3756

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 watch steel and titanium versions

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 GST Perpetual Calendar watch stainless steel version with salmon dial

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 IWC GST Perpetual Calendar Ref. 3756 exists in two materials (stainless steel and titanium) with different dials. Furthermore, each model comes with with four language options for the month and day of the week counters: German, Italian, English and French.

IWC Schaffhausen GST Perpetual Calendar Ref. 3756

The IWC GST Perpetual Calendar Titanium watch 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. This model comes with a black dial featuring special high-contrast white hands and indices, all luminous.

The IWC GST Perpetual Calendar in stainless steel is available in rhodium-plated, salmon, black, white and silver dial versions. These watches are fitted with the integrated GST steel bracelet.

Both stainless steel and titanium 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

Versions

  • IW375601: Titanium case and bracelet, black dial (German)
  • IW375602: Titanium case and bracelet, black dial (Italian)
  • IW375603: Titanium case and bracelet, black dial (English)
  • IW375604: Titanium case and bracelet, black dial (French)
  • IW375605: Stainless steel case and bracelet, rhodium-plated dial (German)
  • IW375606: Stainless steel case and bracelet, rhodium-plated dial (Italian)
  • IW375607: Stainless steel case and bracelet, rhodium-plated dial (English)
  • IW375608: Stainless steel case and bracelet, rhodium-plated dial (French)
  • IW375609: Stainless steel case and bracelet, Salmon dial (German)
  • IW375610: Stainless steel case and bracelet, Salmon dial (Italian)
  • IW375611: Stainless steel case and bracelet, Salmon dial (French)
  • IW375612: Stainless steel case and bracelet, Salmon dial (English)
  • IW375613: Stainless steel case and bracelet, black dial (German)
  • IW375614: Stainless steel case and bracelet, black dial (Italian)
  • IW375615: Stainless steel case and bracelet, black dial (English)
  • IW375616: Stainless steel case and bracelet, black dial (French)
  • IW375617: Stainless steel case and bracelet, white dial (German)
  • IW375618: Stainless steel case and bracelet, white dial (Italian)
  • IW375619: Stainless steel case and bracelet, white dial (English)
  • IW375620: Stainless steel case and bracelet, white dial (French)
  • IW375621: Stainless steel case and bracelet, silver dial (German)
  • IW375622: Stainless steel case and bracelet, silver dial (Italian)
  • IW375623: Stainless steel case and bracelet, silver dial (English)
  • IW375624: Stainless steel case and bracelet, silver dial (French)

Movement
Cal. 79261, 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 case
Screw-down back and crown
Diameter: 43mm, thickness: 16mm
Antiglare sapphire crystal
Water-resistant to 120 m

Dial
Stainless steel version: Rhodium-plated, black, white, silver or salmon
Titanium version: Black

Bracelet
Steel or titanium, pushbutton with security system

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