Every reference with a known width takes the same strap size. Your reference is engraved on the case back or between the lugs at 6 o'clock.
21 mm
Verification: Two sources agree on ref. 310.92.44.50.01.001 and 311.92.44.51.01.007
Attachment: spring bars
44.2 mm case
Indicative information. Check your watch before buying a strap: whatsmylugwidth.com is not responsible for an incorrect size.
The Omega Speedmaster Dark Side takes a 21 mm strap: all 8 references with a known width use 21 mm.
The story · Since 2013
Omega spent years failing to make a black Speedmaster with PVD and DLC before ceramic finally worked in 2013. The result took its name from the far side of the Moon that the Apollo 8 crew saw first, in 1968.
44.25 mm
case diameter kept by every Dark Side generation from 2013 to 2025
Worn by
Unveiled at Baselworld 2013, the Dark Side of the Moon was the first Speedmaster with a black ceramic case, and its dial and bezel were ceramic too. Omega told Fratello it had tried PVD and DLC and never got a result it accepted. Inside sat the in-house column-wheel calibre 9300 from the 2011 Speedmaster Co-Axial Chronograph, and the price was CHF 10,000 before VAT.
A year later the Grey Side of the Moon paired a grey ceramic case with a platinum Pt950 dial. In 2015 Omega added Vintage Black, Sedna Black, Pitch Black and Black Black, plus a White Side of the Moon, and in 2016 a Grey Side with a Gibeon meteorite dial. The single watch had become a sub-collection.
For the 50th anniversary of Apollo 8, Omega fitted the ceramic case with a hand-wound calibre 1869, based on the Lemania-derived 1861, laser-decorated to look like the lunar surface. The skeleton dial showed three counters and no date, and the watch was 2.5 mm thinner than the automatic models. In 2020 the same case carried a carbon-patterned Alinghi edition for the Swiss sailing team.
In January 2024 Omega replaced the Apollo 8 with ref. 310.92.44.50.01.001, powered by the Co-Axial Master Chronometer calibre 3869. The case kept its 44.25 mm diameter but lost 0.8 mm in height, and a Saturn V rocket became the small seconds hand.
Twelve years after the original, Omega presented seven new models across four dials in October 2025. All moved to Master Chronometer calibres 9900, 9908 or 3869, with slimmer cases that keep the 44.25 mm diameter, and new rubber or nylon straps.
The Omega ambassador wore the 2024 Speedmaster Dark Side of the Moon Apollo 8 on the track when he won the Paris 2024 Olympic 100 m final, and kept it on for his 200 m bronze.
The actor wore a Dark Side of the Moon at the Seoul premiere of 6 Underground in December 2019, and British GQ reported in 2023 that he wears his in daily life.
2024. In August 2024 Noah Lyles won the Paris Olympic 100 m in 9.79 seconds, five thousandths of a second ahead of Kishane Thompson, with a Dark Side of the Moon Apollo 8 on his wrist. Omega's photo-finish camera decided the race.
2024. Phillips sold a Dark Side of the Moon Vintage Black, ref. 311.92.44.51.01.006 from about 2017, for HK$57,150 in its Hong Kong Sessions online auction of fall 2024, against an estimate of HK$40,000 to 60,000.
2014. On 31 October 2014 the Dark Side of the Moon won the Revival Watch Prize at the Grand Prix d'Horlogerie de Genève, accepted by Omega president Stephen Urquhart.
The black ceramic Speedmaster won the GPHG prize for the best contemporary reinterpretation of an iconic historical model, the Speedmaster Professional Moonwatch.
The 2025 family: calibre 9900 automatics (.002 to .005) at 15.09 mm thick and a hand-wound calibre 9908 Black Edition (.001) at 13.02 mm, each on rubber or coated nylon.
The product sheets for .001, .002 and .004 list 21 mm between the lugs and 50.00 mm lug-to-lug.
Calibre 3869 Master Chronometer, enamel tachymeter and a titanium Saturn V small seconds hand.
Monochrome gives 21 mm at the lugs tapering to 18 mm at the buckle on a black and yellow rubber strap; Omega lists 12.97 mm thick and 50.00 mm lug-to-lug.
Regatta-timer version for the Alinghi sailing team, with a 4-minute and 5-minute countdown and a rotating Alinghi disc at 6 o'clock, built on the Apollo 8 case with calibre 1865.
Omega lists 21 mm between the lugs; it came on a perforated black rubber strap with a red interior.
Hand-wound skeleton version with a laser-ablated lunar movement and the Jim Lovell quote on the caseback.
Case thickness fell to 13.8 mm, 2.5 mm slimmer than the automatic models, with the same 44.25 mm case.
Grey ceramic case with a sand-blasted platinum 950 dial and the same calibre 9300 (Omega's page for ref. 311.93.44.51.99.002).
Omega lists the same 21 mm between the lugs and a 49.80 mm lug-to-lug; this version came with a ceramic and titanium foldover clasp.
The original Dark Side of the Moon in black zirconium oxide ceramic, calibre 9300, on a black coated nylon fabric strap.
Omega lists 21 mm between the lugs and a 44.25 mm case; WatchTime describes the launch strap as black Cordura fabric with a black ceramic buckle.
Omega Speedmaster Dark Side references in our database. Each card says where its width comes from: listed by the maker (linked to the maker's page in the details), two independent sources agree, or listed in our database and not yet verified by us.
Speedmaster Dark Side Apollo 8 Speedmaster Dark Side Of The Moon Chronograph 44.25mm - Black on Rubber Strap
Lug width: 21 mm
Source: Two sources Attachment: Spring barsCase size: 44.2 mmBlack dialCase material: Black Ceramic
Speedmaster Dark Side of the Moon Black Ceramic 44.25mm - Black on Fabric Strap
Lug width: 21 mm
Source: Not yet verified Attachment: Spring barsCase size: 44.2 mmBlack dialCase material: Black ceramic
Speedmaster Dark Side of the Moon Black Ceramic 44.25mm - Black on Rubber Strap
Lug width: 21 mm
Source: Not yet verified Attachment: Spring barsCase size: 44.2 mmBlack dialCase material: Black ceramic
Speedmaster Dark Side of the Moon Black Ceramic 44.25mm - Full Black on Fabric Strap
Lug width: 21 mm
Source: Not yet verified Attachment: Spring barsCase size: 44.2 mmBlack dialCase material: Black ceramic
Speedmaster Dark Side of the Moon Black Ceramic 44.25mm - Full Black on Rubber Strap
Lug width: 21 mm
Source: Not yet verified Attachment: Spring barsCase size: 44.2 mmBlack dialCase material: Black ceramic
Speedmaster Dark Side of the Moon Black Ceramic 44.25mm - Full Black w/ Red Seconds Hand on Rubber Strap
Lug width: 21 mm
Source: Not yet verified Attachment: Spring barsCase size: 44.2 mmBlack dialCase material: Black ceramic
Speedmaster Dark Side Of The Moon Chronograph 44.25mm - Black on Fabric Strap
Lug width: 21 mm
Source: Two sources Attachment: Spring barsCase size: 44.2 mmBlack dialCase material: Black Ceramic
Speedmaster Dark Side Of The Moon Chronograph 44.25mm - Grey on Leather Strap
Lug width: 21 mm
Source: Not yet verified Attachment: Spring barsCase size: 44.2 mmGrey dialCase material: Grey Ceramic
No reference matches.
The Omega Speedmaster Dark Side takes a 21 mm strap: all 8 references with a known width use 21 mm. The Omega Speedmaster Dark Side ref. 310.92.44.50.01.001 and 311.92.44.51.01.007 take 21 mm (two independent sources agree).
21 mm. Omega lists 21 mm between the lugs for the calibre 9300 models, the Grey Side, the Alinghi, the Apollo 8 and the calibre 9908 2025 model.
The width stays at 21 mm, but the case changed shape: lug-to-lug grew from 49.80 mm on the calibre 9300 models to 50.00 mm on the 2024 and 2025 models, and the cases are slimmer. A 21 mm strap fits by width; Omega does not state whether its own older straps fit the new cases.
Yes. On the 2024 Apollo 8 the rubber strap goes from 21 mm at the lugs to 18 mm at the buckle, closed by a ceramised titanium folding clasp.
The 2013 original came on a black fabric strap with a black ceramic pin buckle. Later versions gained a ceramic and titanium foldover clasp, and the 2025 models use polished-brushed ceramic covers with ceramised titanium folders.
It depends on the movement: Omega lists 16.14 mm for the calibre 9300 models, 15.09 mm for the 2025 automatics, 13.02 mm for the hand-wound calibre 9908 version and 12.97 mm for the 2024 Apollo 8.
The gap between the two lugs that hold the strap, in millimetres. A new strap must match it exactly: 20 mm lugs take a 20 mm strap.
Most watches use spring bars, so any strap of the right width fits. Many smartwatches use their own band system instead, such as Apple Watch bands or Garmin QuickFit.