Glashütte Original · SeaQ

Strap for SeaQ Date Stainless Steel / Blue / Synthetic - 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
Reference1-39-11-10-70-34
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 1-39-11-10-70-34

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The SeaQ 1-39-11-10-70-34, seen from the bench

The Glashütte Original SeaQ 1-39-11-10-70-34 combines modern sports aesthetics with German chronometric engineering. The 39.50mm two-tone case in yellow gold and stainless steel pairs a visible Glashütte Original caliber 39-11 automatic movement with a unidirectional ceramic bezel and 300m water resistance. The 20mm lug width represents the proportional standard for this case diameter, ensuring harmonious integration between case thickness and strap attachment.

Frequently asked questions

What is the exact lug width of the Glashütte Original SeaQ 1-39-11-10-70-34?

The SeaQ 1-39-11-10-70-34 has a lug width of 20mm (distance between the lugs). The lug pins are typically 1.8mm in diameter. Always measure the exact distance between the lugs before purchasing an aftermarket strap to ensure perfect compatibility.

Which strap material suits the two-tone Glashütte Original SeaQ best?

For the yellow gold and stainless steel SeaQ, we recommend Mississippi alligator in dark tones, which contrasts elegantly with the gold case. Vegetable-tanned calf leather develops a natural patina over time. For aquatic environments or intensive use, FKM rubber or polyamide NATO straps excel: rubber resists chlorine and UV rays far better than leather, maintaining authentic marine functionality.

How do I change the strap on my Glashütte Original SeaQ 1-39-11-10-70-34?

Use a spring bar tool (strap changer) to extract the pins from the case lugs. Position the tool's flat end against the pin and push gently until it releases. Once free, remove the old strap and insert the new one by aligning the holes with the pins. Reinsert the pins with controlled, decisive movements. If you lack the tool, consult a qualified watchmaker.

Can I use an aftermarket 20mm compatible strap on my SeaQ?

Yes, any strap with 20mm lug width and 1.8mm pins is compatible. Verify that the strap is designed for sports watches and can withstand at least 10–15 ATM (150 bar) of case pressure. The aftermarket strap must not exceed the original's thickness by more than 2mm, otherwise it may alter case ergonomics.

How long does a leather strap last on a daily-worn Glashütte Original SeaQ?

A quality alligator or calf leather strap, worn daily, typically lasts 18–36 months before replacement. Longevity depends on environment (humidity, saltwater, UV), cleaning frequency, and care. Vegetable-tanned calf ages faster but develops a compelling patina. Vulcanised rubber and NATO straps last longer (36–48 months) due to chemical inertness.

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