The CWC SBS - The Watch Of Choice For UK Special Forces

How The British Ministry Of Defence Went From Omega & Rolex To A Blacked-Out Diver From A Small British Brand

Where plenty of brands look to establish caché among collectors using overstated connections to the military, CWC is legit, having earned a passionate following among military end users and watch enthusiasts alike. CWC is one of the few analog watches still issued today, which sets it in a special category within the W.O.E. community.

Within CWC’s collection, the SBS Diver Issue stands out as a watch with real street cred in our community, having been issued to a Tier One maritime special operations unit and still seeing active service within the British Military today. For a closer look at the dive watch of choice for UKSF, we asked Jonathan Hughes, an avid CWC fan and the operator of CWCaddict.com, for a brief overview of the history of the CWC SBS.

SBS Sergeant Paul McGough wearing a CWC SBS at the battle for Qala-I Jangi Prison, Afghanistan in November 2001.

By Jonathan Hughes

Over the last 70 years, the British Ministry of Defence (MoD) has specified and ordered a variety of dive watches for specialist operators in the British military—starting with Rolex Submariners in the 1950s and early 1960s, the Omega Seamaster 300 in the late 1960s, the Sub again in the 1970s, and CWC from the 1980s onwards along with a smattering of Precistas.

The latest iteration of the official MoD special ops diver’s watch, though, is a blacked-out, day-date, quartz diver from CWC. Officially known as the “UKSF” watch, it is commonly referred to as the “SBS” after the unit that first ordered it, the Special Boat Service.

The modern CWC SBS Diver Issue. (Photo Credit: James Rupley/W.O.E.)

Once an under-the-radar brand virtually unknown outside the British Military, CWC is now appreciated among enthusiasts as the “watch that replaced the MilSub” thanks to Jason Heaton’s excellent article in Hodinkee. The story goes that when the MoD was looking for a more cost-effective replacement for the Rolex Submariner, they turned to CWC, a business set up in 1972 by Ray Mellor exclusively to supply military and government contracts. By the end of that decade, CWC had produced and supplied around 40,000 general service watches, chronographs, stopwatches, and pocket watches, but no diver’s watches as of yet.

A Royal Navy Clearance diver wearing a CWC in the 1980s.

In 1980, CWC delivered its first batch of a new watch dubbed the Royal Navy Diver. Taking inspiration from the Omega Seamaster 300 with a 3-6-9 dial, a big triangle at 12, sword hands, fixed lug bars, and a fully graduated bezel, the CWC RN Diver was initially supplied with a Swiss automatic caliber in 1980 and 1981 before changing over to a quartz movement starting in 1983. The watches were issued to and worn by Royal Navy clearance divers, ships’ divers, and the Special Boat Service (SBS), with some of the earliest issued examples seeing service in the Falklands War of 1982.

An early 1981 CWC RN Divers watch issued to the SBS. (Photo Credit: Jonathan Hughes)

The widespread use of these watches by Royal Navy divers led to a request from the SBS for a specially designed version for their unique use case. The stainless steel cases were to be blackened to make them more stealthy and non-reflective for night-time operations. A day and date function was also added, intended to help keep track of the day whilst on longer missions. Legend has it that the black case was inspired by Royal Marines based in Hong Kong who had their steel dive watches black-coated locally, but as no Royal Navy divers have yet surfaced with a black coating, this is probably just a legend.

When the UK Special Forces directorate was formed in 1987 to bring together the command of the SAS, the SRS (Special Reconnaissance Service), and the SBS, its name was changed from Special Boat Squadron to Special Boat Service. At this time, the specification for the watch that would become the CWC SBS was drawn up.

A modern 1987 Reissue CWC SBS (left) and an original from 1988 (right)  pictured on top of the UKSF “Watch, Wrist, Divers, Day and Date Electronic” specification from 1987. (Photo Credit: Jonathan Hughes/CWC)

The specification for “Watch, Wrist, Divers, Day and Date Electronic” was signed in April 1987 by the officer commanding the Operational Research Unit of the Royal Marines in Poole, the home base of the SBS. It called for a watch “of rugged construction and able to withstand submersion, shock, and vibrations incident to service use in sea depths down to 300 metres”. It would have a case “manufactured from high-quality corrosion-resistant non-magnetic stainless steel finished to a durable matte black” and a “rotatable elapsed time bezel capable of being turned and set by hand.

The outer edge of the bezel is to be knurled sufficiently to allow turning under wet conditions with a gloved hand.” Tritium was used for the luminous material on the hands and dial, and the dial was marked with a circled T to denote the presence of the radioactive luminescent material. Tests for water resistance, shock, impact resistance, and accuracy were all strictly defined.

A 1988 CWC SBS with an acrylic bezel. (Photo Credit: CWC)

The first run of 100 CWC SBS watches was delivered in 1988 and was assigned a new NATO Stock Number (NSN) of 6645-99-7995443 as well as being marked with 0552, the Royal Navy’s purchasing code at the time. In contrast to later models, the earliest examples featured an acrylic bezel insert, similar to the early automatic Royal Navy watches.

The next batch wasn’t produced until 1992, with another 150 watches being supplied. The bezel was changed to a metal insert with wide hash marks similar in style to the previous acrylic bezel.

1992 CWC issue watches. (Photo Credit: Jonathan Hughes)

Through the 1990s and into 2000, another 750 watches were supplied with the Royal Navy purchasing code changing from 0552 to 0555 from 1993 onwards. As well as the SBS, operators from the SAS were also issued these watches. CWC SBS watches were worn by British Special Forces in all the major conflicts of the next 20 years — in both Gulf Wars, and famously in Afghanistan by Sergeant Paul McGough at the battle for Qala-I Jangi Prison in November 2001.

Special Boat Service operator Stephen Burns wearing an issued CWC SBS in Afghanistan.

Around 2000, the MoD discontinued the old-school Royal Navy watch, which had been issued alongside the SBS throughout the 1990s, making the SBS the default-issued dive watch in the British Military. Another 500 SBS watches were ordered in 2001, delivered in three batches over the next two to three years with small variations in the bezel and caseback markings. These were issued more broadly to divers in the British Army’s Royal Engineers, showing the broader distribution beyond the special operations community.

In 2005, another 250 watches were ordered specifically for the Royal Engineers—the first 100 were repurposed from a batch made in 2004 that had been marked with the Royal Navy’s 0555 code, some of which had been sold over the counter to civilians at Silvermans, a popular source of MoD surplus. In this batch, the 0555 was crossed out, and W10 (the code for the British Army) was marked above that. The second 150 were manufactured with W10 markings, the only time that a CWC dive watch has been factory-marked “W10”.

Issued examples of the CWC SBS from 2005. (Photo Credit: Jonathan Hughes)

With a total of around 1,600 issued watches between 1988 and 2005, an issued SBS from this era is not a common watch by any means but also not offensively rare if you are a collector looking to track one down. A good, legitimate issued SBS with the circled T on the dial can still be had for under £2,000 (around $2,500) although some years and variations are rarer and more sought after than others. In 2004 and 2008, batches of SBS watches that were identical to issued examples were also produced for the civilian marketplace, serving as an indistinguishable and cheaper alternative to the “real thing”. In fact, some of these “civvie” watches still ended up on the wrists of serving military and police, so you could argue there’s really no difference at all.

A Royal Navy Clearance Diver wearing a CWC SBS.

For over a decade, the MoD placed no further orders for CWCs, purchasing a mix of other civilian-spec dive watches, including several Citizen models and G-Shocks. But in 2016, orders for the CWC SBS were restarted, with some watches marked 2014 and 2015 being supplied as a trial batch and larger scale orders starting in 2017 and continuing today. Still used by the SBS, the watch is now also supplied to a broader range of units and roles, including to the Paras, the Royal Marines, Royal Navy specialists, the Royal Engineers, and the Submarine Service.

A 2015 CWC SBS Issued to the MoD. (Photo Credit: Jonathan Hughes)

Over the years, CWC has upgraded the SBS albeit in a subtle fashion. The luminous material that was once tritium is now Super-LumiNova. The crystal is now sapphire instead of mineral glass, and the bezel now rotates with 120 clicks instead of 60 clicks, small changes that add up to a more durable and premium-feeling watch. Still, the modern CWC SBS is more or less the same design as the original in 1988, and you can still buy one directly from CWC that is identical to the current issued examples. As mentioned in the Dispatch detailing the US Military’s relationship with Marathon, issued analog diver’s watches in active military service are few and far between.

W.O.E.’s personal 1990's Tritium dial CWC SBS (Photo Credit: James Rupley/W.O.E.)

For the British Military, the CWC SBS stands out as a design that was developed for elite special operators in the 1980s, earning a reputation as a dependable diving tool over the decades. Despite massive leaps and bounds in technology in many other areas, the CWC SBS—a straightforward quartz dive watch made in Switzerland—remains in active service, still worn and trusted in the field by the British Military.

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About The Author: Jonathan Hughes is a UK-based collector of British military and independent watches. His fascination with CWC started when he saw an early automatic Royal Navy dive watch at a London auction some years ago, and realised that a British company had been quietly supplying watches to the Ministry of Defence for many decades, at that time almost unknown to the wider watch collecting world. His CWC collection now numbers around 300 watches and clocks, and he founded and runs the cwcaddict.com website and blog. He is on Instagram at @jjhughes1969 and reposts CWC photos on @cwc_addict.