Tissot · Seastar

Strap for Seastar 1000 Powermatic 80 43 Stainless Steel / Grey / 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
ReferenceT120.407.11.081.01
FamilySeastar
MovementETA caliber C07.111 Hours, Minutes, Seconds | Date
CaseCeramic, 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 Seastar T120.407.11.081.01

Selected for the 21 mm lug width · workshop selection

All 21 mm straps →

The Seastar T120.407.11.081.01, seen from the bench

The Tissot Seastar T120.407.11.081.01 is a 43 mm stainless steel sports diving watch powered by the ETA C07.111 automatic Swiss movement. It features a ceramic bezel, sapphire crystal with anti-reflective coating, and 300 meters water resistance. The 21 mm lug width is specific to this model and must be verified on the mounted case to ensure proper strap compatibility.

Frequently asked questions

What is the lug width of the Tissot Seastar T120.407.11.081.01?

The lug width of the Tissot Seastar T120.407.11.081.01 is 21 mm. This measurement refers to the internal distance between the case lugs and is specific to this model. Verification with a digital calliper positioned between the lug attachments is essential, as only straps designed for 21 mm will fit correctly without excessive play or mounting stress. Do not use 20 mm or 22 mm straps, which would create fitting issues and potential lug damage.

Which strap material is recommended for the Tissot Seastar T120.407.11.081.01?

The Tissot Seastar T120.407.11.081.01, with its 43 mm proportions and ceramic bezel, pairs ideally with vegetable-tanned alligator leather for enduring elegance, European vegetable-tanned calf for tactile intensity, technical polyamide NATO for informal versatility, or vulcanised rubber for frequent aquatic use. The choice depends on intended purpose: alligator and calf for daily and formal contexts, NATO for rapid stylistic transitions, rubber for regular marine environments.

How do you change the strap on the Tissot Seastar T120.407.11.081.01?

Strap replacement is performed by removing the spring bars connecting the strap to the case lugs. Using a spring bar remover tool, apply gentle pressure to one side of the pin until it retracts, allowing strap removal. Repeat on the opposite side. For installation, thread the new strap through the lugs and reinsert the pins until they click into place. This delicate operation is best performed by a specialist to avoid case scratching or lug damage.

Is an aftermarket 21 mm strap compatible with the Tissot Seastar T120.407.11.081.01?

Yes, any aftermarket artisanal strap with certified 21 mm lug width is compatible with the Tissot Seastar T120.407.11.081.01. MilanoStraps produces custom straps in this dimension with premium materials (alligator, calf, shell cordovan, vegetable leather). Compatibility is guaranteed if the lugs are correctly calibrated; we recommend verifying tolerances, especially with vintage straps where passant thickness may vary by tenths of a millimetre.

What is the average lifespan of a leather strap for the Tissot Seastar T120.407.11.081.01?

A quality leather strap (alligator, vegetable-tanned calf, shell cordovan) has a lifespan of 2 to 5 years with daily use, depending on climate, frequency of wear, and maintenance. Humid and hot environments reduce longevity; dry climates and cool storage extend it. Vegetable tanning ages nobly, developing patina, whilst chrome tanning degrades faster. Regular maintenance with natural conditioning creams significantly extends strap life. Rubber straps typically last 4–6 years before elasticity diminishes.

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