Glashütte Original · SeaQ

Strap for SeaQ Date Stainless Steel / Blue / Synthetic - Pin

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
Reference1-39-11-10-90-08
FamilySeaQ
MovementGlashütte Original caliber 39-11 Hours, Minutes, Seconds | Date
CaseYellow Gold, Stainless 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 1-39-11-10-90-08

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The SeaQ 1-39-11-10-90-08, seen from the bench

The Glashütte Original SeaQ is equipped with the automatic caliber 39-11 with functions of hours, minutes, seconds and date. The watch features 20mm lugs and represents the German manufacturer's dive watch offering. The in-house movement ensures the essential timekeeping indications through a proprietary mechanism.

Frequently asked questions

What is the exact lug width of the Glashütte Original SeaQ 1-39-11-10-90-08?

The lug width of the SeaQ is precisely 20 mm, measured as the linear distance between the suspension pins of the case. A 20 mm strap has a specific width between the anchor points that insert into the case lugs. Measurement errors—mistaking 20 mm for the standard 22 mm—result in a visually disproportionate strap that is difficult to wear. Milano Straps catalogs 20 mm straps with constructive precision, guaranteeing exact geometric compatibility.

Which strap material best complements the SeaQ's two-tone yellow gold and steel case?

Alligator leather—in cognac, tobacco, or black tones—represents the most natural pairing for the bicolour. The texture of alligator captures light in a way complementary to the mixed gold and steel case luminosity. Vegetable-tanned calf leather offers a contemporary alternative, developing authentic patina over time. For those using the watch in aquatic or high-wear environments, NATO in high-tenacity polyamide provides durability without maintenance. FKM rubber is the pure technical choice: guaranteed wrist grip, intrinsic water resistance, and virtually indefinite durability.

How do you change the strap on a watch with 20 mm lugs?

Strap changing requires a spring bar tool—a specific instrument with a flat end that allows compression of the suspension pin internal to the lugs. Insert the tool under the old strap, compress the pin, and extract the strap from the case. Repeat on the other side. Insert the new strap by aligning one end into the lug, then compress the pin until the second end locks securely. With 20 mm lugs, precision is critical: the limited space tolerates no misalignment. Milano Straps provides detailed photographic guides for this procedure.

Are aftermarket 20 mm straps truly compatible with the SeaQ 1-39-11-10-90-08?

Yes, with the fundamental condition that they respect the 20 mm lug width with constructive precision. An incompatible aftermarket strap causes visual issues (disproportionate to the wrist) and mechanical problems (lateral movement, lug misalignment). Milano Straps produces 20 mm straps specifically calibrated for this width, guaranteeing encaje—the perfect fit—to the SeaQ's lugs. Every strap is verified pre-shipment to exclude constructive tolerances that generate unwanted play.

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

A quality artisanal alligator or calf strap typically lasts 3–5 years with daily wear, depending on exposure to moisture, perspiration, and direct sunlight. Vegetable tanning—used by Milano Straps—develops patina rather than degrading, extending the perceived aesthetic vitality even beyond five years. Leather, with periodic maintenance (conditioning with specific products), ages nobly. NATO in polyamide lasts indefinitely without degradation. FKM rubber maintains elasticity for 7–10 years even in extreme environments. Milano Straps recommends owning several and rotating them: this practice extends the life of each strap by reducing moisture accumulation on a single material.

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