This automatic IWC GST Deep One Ref:3527 Limited Edition in titanium is rated 9.6 out of 10. It comes with service receipt in 2018, box and undated warranty card.
This is an extremely rare titanium IWC Deep One GST 3527. It has an integral titanium link bracelet, and three screw-down winding crowns. The crown at 2 o’clock adjusts the matte black inner rotating bezel with luminous yellow Arabic numeral markers and 15 minute dive warning, and the crown at 4 o’clock resets the depth gauge that measures the current and maximum depth. It also perforated to fit onto the end of an external pressure tube (included) for testing the depth measuring mechanism that is pre-set to an environmental pressure of 1013.25 millibars at 15 degrees.
The IWC Deep One GST Ref:3527 was introduced in 1999, the first diver’s watch with a mechanical depth gauge up to 45 meters. The mechanical depth system is a coiled Bourdon tube that is a pressure-sensing element; as water enters the tube, it goes rigid. This system is independent from the watch movement.