Omega
Speedmaster Broad Arrow 3851.50.11— lug 20mm
Omega Speedmaster Broad Arrow 3851.50.11: 20mm strap. Alligator, box calf, shell cordovan and rubber, cut and stitched in Milano. Choose your leather.
Artisanal Note
"This model requires a precise 20mm lug width to preserve the original sartorial balance."
Technical Specifications
Omega 3851.50.11The essential strap measurement.
Browse 20mm straps →3851.50.11
Omega caliber 3303 Hours, Minutes, Small Seconds | Date | Chronograph, Column wheel
The Heritage
Compatible Straps
Selected for the 20mm lug width of the Speedmaster Broad Arrow
FAQ
What lug width does the Omega Speedmaster Broad Arrow 3851.50.11 have?
The Omega Speedmaster Broad Arrow 3851.50.11 features a 20mm lug width. This measurement is specific to the 42mm case diameter and is determined by the distance between the lug terminals. To verify it correctly, measure the internal space between the case lugs using a calliper: it must match exactly 20mm.
Which strap material is best suited to the Speedmaster Broad Arrow 3851.50.11?
The best material depends on usage and personal style. For formal elegance, black alligator develops a geometric grain that pairs perfectly with the brushed steel case. For everyday versatility, vegetable-tanned calf leather matures over time and develops a patina that accompanies the natural evolution of the case. For technical use, a rubber strap maintains the chronograph's instrumental identity. A steel deployant clasp completes the case aesthetics.
How do you change the strap on the Omega Speedmaster Broad Arrow 3851.50.11?
Strap replacement requires a spring bar tool to extract the lug pins. Position the watch with the lug facing upward, locate the small lateral hole of the pin, insert the extractor and gently push until the pin comes out completely. Repeat the operation on the other lug. Insert the new strap's pins into the lugs following the correct direction: the pin must penetrate from one side and exit the other, locking with a slight click. Avoid forcing to prevent damage to the 20mm lugs.
Is there an aftermarket strap compatible with the 3851.50.11?
Yes, any strap with a 20mm lug width is compatible with the Speedmaster Broad Arrow 3851.50.11, provided you use spring bars of the correct length and diameter. Milano Straps offers a complete collection of 20mm straps in alligator, calf, rubber and fabric, all customisable in colour, stitching and length. The Casati Milano atelier also creates fully bespoke straps with direct choice of materials and 18-month warranty.
How long does a leather strap last on the Speedmaster Broad Arrow 3851.50.11?
A quality leather strap, with vegetable tanning, lasts approximately 3-5 years with moderate daily use, developing a natural patina that makes it increasingly distinctive. Durability depends on ambient humidity, sun exposure and frequency of use. Straps made with noble leathers such as alligator tend to last longer thanks to the denser skin structure. A rubber or technical fabric strap can last 5-7 years while maintaining better resistance to water and tearing.
The next step
The right strap isn’t chosen. It is built, together.
From the atelier appointment to delivery, every step is made for those who know that things done well take time. Rare leathers, one piece at a time, eighteen months of warranty.
Request an appointment →By appointment only · Milan
The atelier's website: casatimilano.com