Tissot · Seastar

Strap for Seastar 1000 Powermatic 80 Silicium 43 Stainless Steel / Blue / Bracelet

Takes 21 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width21 mm
Case diameter43 mm
ReferenceT120.407.11.041.01 (aka: T1204071104101)
FamilySeastar
MovementETA caliber C07.811 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 Seastar T120.407.11.041.01 (aka: T1204071104101)

Selected for the 21 mm lug width · workshop selection

All 21 mm straps →

The Seastar T120.407.11.041.01 (aka: T1204071104101), seen from the bench

The Tissot Seastar features the ETA C07.811 caliber with indication of hours, minutes, seconds, and date. The model has 21mm lugs for the strap. The reference T120.407.11.041.01 identifies this version of the Swiss brand's sports collection.

Frequently asked questions

What is the lug width of the Tissot Seastar T120.407.11.041.01?

The Tissot Seastar T120.407.11.041.01 features a 21-millimetre lug width. This measurement represents the internal distance between the two case lugs where the strap is secured. All straps compatible with 21mm lug width mount without adapters or structural modifications.

Which strap is recommended for the Tissot Seastar T120.407.11.041.01?

Selection depends on intended use. For diving and aquatic environments, structured rubber or NATO textile straps ensure complete waterproofing and rapid drying. For alternating marine and urban wear, vegetable-tanned calf leather develops an elegant patina over time. Shell cordovan, with its naturally granular structure, establishes coherent visual dialogue with the case's brushed finishing.

How do I change the strap on the Tissot Seastar T120.407.11.041.01?

Mounting is accomplished via the lug pins. Use a dedicated spring bar tool to compress the internal pin and extract the metal bar securing the original strap. Insert the new strap by sliding the pin into the lug grooves until audible locking engagement. Avoid hammers or improvised tools that may damage the stainless steel lugs.

Are aftermarket straps compatible with the Tissot Seastar T120.407.11.041.01?

Yes, all 21mm lug width straps are compatible with this model. The market offers hundreds of variants: Italian artisan leather, cordura NATO, rubber sport solutions, vintage canvas options. MilanoStraps provides curated selections for this specific reference, guaranteeing construction quality and aesthetic coherence with the diver's character.

How long does a leather strap last on a dive watch like the Seastar?

Longevity depends on frequency of water exposure and humidity contact. A vegetable-tanned leather strap, if dried promptly after exposure and periodically treated with natural waxes, maintains structural integrity for 3-5 years of moderate use. Frequent diving substantially reduces lifespan: in these cases, rubber or NATO straps represent more rational investment. Leather patina, however, improves over years, transforming wear into aesthetic character.

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