Technical Archive

Breitling
Superocean A17366021B1S1— lug 20mm

Breitling Superocean A17366021B1S1: 20mm strap. Alligator, box calf, shell cordovan and rubber, cut and stitched in Milano. Choose your leather.

Superocean 42 Stainless Steel / Black / Rubber / Pin

Artisanal Note

"This model requires a precise 20mm lug width to preserve the original sartorial balance."

Technical Specifications

Breitling A17366021B1S1
Lug Width
20 mm

The essential strap measurement.

Browse 20mm straps →
Reference

A17366021B1S1

Movement

Breitling caliber Caliber 17 Hours, Minutes, Seconds | Date

The Heritage

The Breitling Superocean A17366021B1S1 is a 42mm stainless steel dive instrument with a 20mm lug width, descending from the 1957 Superocean line designed for professional divers. It features a unidirectional bezel, luminescent indices, and a Breitling Caliber 17 automatic movement (ETA 2824-2 derivative) with approximately 38 hours of power reserve. Water resistant to 300 meters with screw-down caseback and Triplock crown, the watch includes a sapphire crystal with anti-reflective coating and a hierarchical dial displaying hours, minutes, central seconds, and date at 3 o'clock.

FAQ

What is the lug width of the Breitling Superocean A17366021B1S1?

The Breitling Superocean A17366021B1S1 features a 20mm lug width. This measurement can be verified directly on the case using a millimetre calliper, measuring the internal distance between the two lugs. Any strap with a 20mm attachment is compatible with this reference.

What is the best strap for the Breitling Superocean A17366021B1S1?

The ideal choice depends on the intended use. For formal or business-casual wear, a matte alligator strap in 20mm complements the stainless steel case without overpowering the dial. For sporting or marine use, vulcanised rubber or ballistic nylon NATO straps are technically more suitable, offering water resistance and durability under intensive use.

How do you change the strap on the Breitling Superocean A17366021B1S1?

Strap replacement is carried out by removing the two springbars securing the original strap to the lugs. A forked-tip springbar tool is sufficient to lever each springbar and release it. It is advisable to work on a soft surface to avoid scratching the case. The new 20mm strap is fitted by engaging one springbar first, then the other.

Are there aftermarket straps compatible with the Breitling Superocean A17366021B1S1?

Yes. Any aftermarket strap with a 20mm attachment is compatible with the Breitling Superocean A17366021B1S1, provided the springbars have the correct diameter for the lugs of this model. Milanostraps.it offers a curated selection of artisan straps in various leathers and technical materials, all produced for this specific lug width.

How long does a leather strap last on a Breitling Superocean A17366021B1S1?

Longevity depends on the leather type, frequency of wear, and exposure to perspiration and moisture. A vegetable-tanned calfskin strap, properly maintained with protective wax, typically lasts 2 to 4 years with daily wear. Alligator leather, owing to its dense scale structure, is more resilient and may exceed 5 years. Technical rubber is unaffected by moisture but may harden over time due to UV exposure.