Rolex Double Red Sea-Dweller Ref. 1665 Mk. IV

Case and Dial Design

The watch features a 40mm stainless steel case. According to the source, the case retains its original chamfers, showing only minor signs of use. The bidirectional bezel is fitted with an original 'fat-font' insert that has developed a dark gray patina, with the tritium pearl still present at the 12 o'clock position. The crystal is an original T39 Super Dome.

The dial is a matte black Mk. IV version, which includes the distinctive double-red text. The hour markers have aged to a cream color, matching the original tritium hands. The source notes that the calendar disc is original, featuring 'open' numerals for the six and nine. The case back is specified as the 'round text' version, associated with the transition to the subsequent model.

The watch is equipped with a helium escape valve, a feature developed for saturation diving.

Movement and Functionality

The movement within this Sea-Dweller is stated to be running accurately following a recent, complete service. The mechanical functions include the time and a date display, supported by the specific helium release functionality intended for deep-sea diving environments.

No internal imagery of the movement is provided, but the source asserts that the watch is a functional specimen from 1977. Tests conducted under ultraviolet light on the dial and hands indicated no degradation, according to the provided documentation.

Provenance and Documentation

It is identified by the serial number in the 5.2 million range, placing its production in 1977. The watch is also paired with a stainless steel Oyster 93150 bracelet featuring 585 end links and a diving extension link.

The platform specifies that the technical information and stated condition are based on data provided by the original source and seller. It explicitly states that it does not independently verify the authenticity of parts or their functional status.