Amanico explores the ultra-rare 'Red Depth' Rolex watches from the mid-1950s, presenting them as a compelling theme for a vintage collection. He highlights iconic references like the GMT-Master 6542 and various Submariner models, noting the distinct red depth rating on their dials.
Here we are in the ultra rare category. We are speaking of references which were made in 1955 for the GMT MASTER 6542 and Submariner 6536-1, and in 1956 for the 6610 Explorer, 6536 / 6538 and 6538 Submariner.
Here is what I found:
IV 1955 6542 " Red Depth " ( Credit picture: Christies ).

IV 1955 6536-1. ( Credit picture: Only Vintage ).

1956 for this 6610 Explorer. ( Credit picture: Phillips ).

1956 again, for these double reference Submariner 6536 / 6538 ( Christies ).

Credit picture: Bexsson:

1956 for this Submariner 6538. ( Credit picture: Christies ).

And not a Submariner by Rolex but from Tudor, has to be mentioned here, the elusive 7923 Red Depth, circa 1956:
Interestingly, after that era, the red writing was related to the name of the model, not to the depth anymore, on some Rolex: Daytona, Red Submariner, Red Sea Dweller, and the more modern Yacht-Master. And they are not as rare as the Red Depths!
Best,
Nicolas
About the Rolex Rolex Submariner Date Ref. 1680
The Rolex Submariner reference 1680 is notable as the first Submariner model to feature a date complication, marking a significant evolution for the line. Introduced in the late 1960s, it bridged the gap between the earlier no-date Submariners and later iterations, offering enhanced functionality while retaining the robust characteristics of the professional tool watch. This reference is distinguished by its single cyclops date magnifier on the crystal, a feature that would become a hallmark of many subsequent Rolex models.
This reference typically features a 40mm steel case, housing the self-winding Caliber 1575 movement. The movement provides a power reserve of approximately 48 hours. The crystal is acrylic, commonly referred to as Plexiglas, contributing to its vintage aesthetic. Water resistance for the 1680 is rated at 200 meters, consistent with its design as a reliable underwater instrument.
For collectors, the reference 1680 is highly sought after, particularly early examples with "Red Submariner" dials where the word "Submariner" is printed in red. These variants represent a distinct period in Rolex's production history and are prized for their rarity and aesthetic appeal. The 1680 appeals to those who appreciate the blend of historical significance, functional design, and the tangible qualities of vintage Rolex manufacturing.
Specifications
- Caliber
- Cal.1575
- Case
- steel
- Diameter
- 40mm
- Dial
- black
- Water Resist.
- 200m
- Crystal
- Acrylic (Plexiglas)
About the Rolex 6610 Ref. 6610
The Rolex Explorer reference 6610 represents an early iteration of the Explorer line, succeeding the reference 6350 and preceding the 1016. It is characterized by its robust construction and clear, legible dial, designed for reliability in various conditions. This reference maintained the foundational aesthetic of the Explorer, focusing on utility and durability without extraneous features, establishing the core identity of the model series. It was produced for a relatively short period, making it a distinct transitional piece within the Explorer's history.
This reference features a stainless steel Oyster case measuring 36 mm in diameter, providing a balanced presence on the wrist. It is equipped with the automatic Caliber 1530 movement, known for its reliability and precision, offering a power reserve of approximately 42-48 hours. The watch utilizes an acrylic crystal, typical for its era, contributing to its vintage appeal and offering good shatter resistance. Its construction allowed for a water resistance rating of 100 meters, suitable for general wear.
For collectors, the reference 6610 is significant as an early example of the Explorer, bridging the gap between its initial experimental phase and its long-running, more standardized production. Its relatively short production run means fewer examples are available compared to later references. Collectors often seek out examples with original dials and hands, which can exhibit various patinas over time, adding to their individual character and historical appeal within the broader context of Rolex tool watches.
Specifications
- Caliber
- Cal. 1530
- Case
- Stainless steel
- Diameter
- 36 mm
- Dial
- Black
- Water Resist.
- 100m
- Crystal
- Acrylic
About the Rolex Submariner Ref. 6536
The Rolex GMT-Master reference 6536 is an early example of the GMT-Master line, distinguished by its smaller case size compared to later iterations. This reference is notable for its introduction of the GMT complication, allowing for the simultaneous display of two time zones. It represents a foundational piece in the development of Rolex's travel watch offerings, preceding the more commonly seen 6542.
This reference features a stainless steel case measuring 37 mm in diameter, housing an automatic movement, specifically the caliber 1030. The watch is fitted with an acrylic crystal and offers a water resistance of 200 meters. The power reserve for this movement is approximately 42 hours, providing reliable timekeeping for daily wear.
For collectors, the 6536 holds interest as an early and less common GMT-Master reference. Its position in the lineage of the model highlights the initial design language and technical specifications before subsequent refinements. Variants within this reference may include subtle dial or bezel differences, which are often points of scrutiny for enthusiasts seeking originality.
Specifications
- Caliber
- 1030
- Case
- Stainless steel
- Diameter
- 37 mm
- Dial
- Black
- Water Resist.
- 200m
- Crystal
- Acrylic
About the Rolex GMT-Master Ref. 6542
The GMT Master reference 6542 was introduced in 1955 as a specialized tool watch for pilots. It is notable for its dual time zone complication, achieved through a rotating 24-hour bezel and an independently adjustable 24-hour hand. This reference marks the initial iteration of the GMT Master line, establishing the core functionality and aesthetic that would define subsequent models. Its development addressed the need for a watch capable of displaying multiple time zones simultaneously, a requirement that emerged with the advent of intercontinental air travel.
The 6542 features a 38mm stainless steel case, housing the automatic caliber 1036. This movement provides a power reserve of approximately 42 hours. The watch is fitted with an acrylic crystal and offers a water resistance of 50 meters. Early examples of the 6542 are distinguished by a Bakelite bezel insert, which was later replaced by an aluminum insert due to durability concerns. The dial is typically black, often featuring gilt printing on early examples.
This reference holds significance for collectors as the foundational model of the GMT Master series. Its distinct characteristics, particularly the early Bakelite bezels and specific dial configurations, are key points of interest. The 6542 represents the original design intent for a pilot's GMT watch, making it a reference point for understanding the evolution of the model line. Variants exist with different bezel materials and dial details, contributing to its collectibility.
Specifications
- Caliber
- 1036
- Case
- Stainless steel
- Diameter
- 38 mm
- Dial
- Black
- Water Resist.
- 50m/165ft
- Crystal
- Acrylic
About the Rolex Submariner Ref. 6538
The Submariner reference 6538 is recognized for its prominent crown and lack of crown guards, a characteristic shared with early Submariner iterations. This reference represents a significant period in the development of the Submariner line, preceding later designs that incorporated more protective features for the winding crown. It is often distinguished by its larger crown compared to other early Submariner models, contributing to its distinct visual profile within the collection.
This particular reference features a stainless steel case measuring 37 mm in diameter, housing an automatic movement, the caliber 1030. The watch is fitted with an acrylic crystal and offers a water resistance rating of 200 meters. The power reserve for the caliber 1030 is approximately 42 hours. The dial is black, and the watch is equipped with a rotating unidirectional aluminum bezel.
For collectors, the reference 6538 is notable for its early production characteristics and its place in the evolution of the Submariner. Its specific design elements, such as the 'big crown' and absence of crown guards, make it a point of interest for those studying the progression of the model. Variants within this reference may include different dial texts or bezel insert types, which are often points of detailed examination for enthusiasts.
Specifications
- Caliber
- 1030
- Case
- Stainless steel
- Diameter
- 37 mm
- Dial
- Black
- Water Resist.
- 200m
- Crystal
- Acrylic