Archimede · Sporttaucher

Strap for SportTaucher GMT Stainless Steel / Black / Bracelet

The SportTaucher GMT Stainless Steel / Black / Bracelet takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width20 mm
Case diameter42 mm
ReferenceUA8974B-GS-A1.1
FamilySporttaucher
MovementSellita caliber SW200-1 a 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 Sporttaucher UA8974B-GS-A1.1

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Sporttaucher UA8974B-GS-A1.1, seen from the bench

The Archimede Sporttaucher reference UA8974B-GS-A1.1 is a diver's watch equipped with the automatic Sellita SW200-1 movement. The caliber offers hour, minute, second, and date indications. The watch features 20mm lugs for the strap.

Frequently asked questions

What is the lug width of the Archimede Sporttaucher UA8974B-GS-A1.1?

The Archimede Sporttaucher UA8974B-GS-A1.1 features a lug width of 20 mm. This measurement is standard for 41.50 mm cases and ensures balanced strap distribution on the wrist without lateral tension. Always verify with a digital calliper positioned between the inner sides of the lugs.

Which strap is recommended for this Archimede model?

For the Sporttaucher UA8974B-GS-A1.1, we recommend European alligator (fine microscopic grain, aligned with German design precision), vegetable-tanned calf (develops noble patina over years) or polyamide NATO (functional for frequent diving and marine environments). FKM rubber suits those alternating water sports and formal wear.

How do I change the strap on the Archimede Sporttaucher UA8974B-GS-A1.1?

Obtain a spring bar removal tool with two flat, tapered ends. Rest the watch on the table edge with the lug facing downward, insert the tool beneath the spring bar until it pops free. Repeat on the opposite side. Insert the spring bars into the new strap, align the lugs, and press until you hear a click. If uncertain, consult a watchmaker.

Can I use aftermarket straps with 20 mm lug width?

Yes, any strap with 20 mm lug width is compatible with the Sporttaucher UA8974B-GS-A1.1. Avoid variations (19 mm or 21 mm) as they create lateral stress. Choose specialised artisanal strap manufacturers to ensure construction quality consistent with the watch's value.

How long does a leather strap last on this watch?

A quality leather strap (alligator, vegetable-tanned calf) typically lasts 3-5 years with daily wear. Longevity depends on climate, exposure to salt water, and maintenance. Vegetable-tanned calf ages nobly with golden patina and can be regenerated after 2 years with specialist treatments. Polyamide NATO straps last 5-7 years and resist marine environments better.

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 →

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

The atelier's website: casatimilano.com