Glashütte Original · SeaQ

Strap for SeaQ Date Stainless Steel / Blue / Rubber / Folding

Takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width20 mm
Case diameter40 mm
Reference1-39-11-09-81-33
FamilySeaQ
MovementGlashütte Original caliber 39-11 Hours, Minutes, Seconds | Date
CaseStainless Steel

Spring bar

Swiss Standard universal spring bars

The right category for this model · 316L steel, all lug widths 13–26 mm

Straps for the SeaQ 1-39-11-09-81-33

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The SeaQ 1-39-11-09-81-33, seen from the bench

The Glashütte Original SeaQ 1-39-11-09-81-33 is a 39.50 mm stainless steel diver watch featuring the automatic Glashütte Original 39-11 caliber, visible through a sapphire caseback. It offers 100 meters water resistance, hours, minutes, seconds, and date function with a unidirectional bezel and screw-down crown. The 20 mm lug width enables broad strap compatibility while maintaining construction precision.

Frequently asked questions

What is the lug width of the Glashütte Original SeaQ 1-39-11-09-81-33?

The lug width of the Glashütte Original SeaQ is 20 mm. This measurement represents the internal distance between the metal lugs and is the critical parameter for any aftermarket strap compatibility. Accurate measurement requires positioning a digital calliper perpendicular to the two attachment points, excluding the lugs themselves.

Which strap material is best suited for the Glashütte Original SeaQ?

The optimal choice depends on intended use. For formal settings, premium alligator or vegetable-tanned calf leather enhances the elegant 39.50 mm case proportion. For authentic sports wear, heavyweight cotton NATO or FKM rubber maintains genuine dive credentials. Aged calf or shell cordovan represents the ideal compromise between aesthetic versatility and constructive resilience.

How should the SeaQ strap be changed correctly?

Strap replacement occurs via extraction of the lug pins using a pin removal tool—essential equipment. Position the watch face-down, insert the tool from the upper lug entrance maintaining constant pressure, extract the pin until complete disengagement. Repeat on the opposite lug. Insert the new strap aligning the holes and reinsert pins until audible click. Verify the strap alignment against the lugs.

Is a 20 mm aftermarket strap fully compatible with the 1-39-11-09-81-33?

Yes, any strap specified at 20 mm is 100% compatible with the Glashütte Original SeaQ regardless of material or manufacture. Lug width is invariable on this reference. Ensure however that strap thickness at the lug entry does not exceed 3.5 mm to avoid lateral pressures on the lugs.

What is the average lifespan of a leather strap for the SeaQ?

A premium leather strap—alligator, shell cordovan, vegetable-tanned calf—maintains functional and aesthetic integrity for 4-6 years of moderate daily wear. Ageing is not deterioration: it is patina evolution. When maintained properly, buckles and keepers exceed a decade. Controlled humidity, moderate sunlight exposure and regular cleaning significantly extend longevity.

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.

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Casati Milano · Via XX Settembre 15, Milan · by appointment only