Strap for 150th Anniversary Automatic Small Seconds

The lug width of the Tissot Heritage T66.1.721.31 is 20 millimetres. This dimension is compatible with the vast majority of artisanal watch straps in the market and permits versatile pairings in leather, rubber and synthetic materials. To verify absolute compatibility, it is advisable to measure the space between the fixed lugs on the case using a calliper with precision to the tenth of a millimetre.

The choice depends upon intended use and aesthetic context. A medium brown alligator strap creates coherent heritage pairing. Vegetable-tanned calf develops natural golden patina over time. NATO straps ensure practical sportiness and ease of replacement. FKM rubber is ideal for aquatic or informal professional environments. We recommend considering the stainless steel case colour, which harmonises with all terracotta, grey and black tonalities.

The Tissot Heritage T66.1.721.31 likely features fixed lugs with screws. Use a dedicated spring bar tool to gently lift the internal spring of the lug, simultaneously unscrewing the lateral screws with a watchmaker's screwdriver (0.6–0.8 mm diameter), and slide the strap clear of the case shoulders. Repeat the procedure symmetrically for the opposite side. Insert the new strap by first threading one lug, fasten the screws without excessive pressure (1.2–1.5 Nm torque), verify absence of play. The operation requires 10–15 minutes for experienced users.

Yes. The Tissot Heritage T66.1.721.31, thanks to its standard 20-millimetre lug width, is fully compatible with artisanal aftermarket straps. We recommend verifying that the strap has been constructed to tolerances between 19.8 and 20.2 millimetres. Certified straps in alligator, calf, shell cordovan and FKM rubber guarantee decade-long durability if subjected to ordinary maintenance (annual cleaning, conditioning every two years for natural leathers).

An artisanal-quality natural leather strap, subjected to ordinary wear (medium-light usage 4–5 days weekly), achieves 3–4 years of useful life before structural fibre degradation necessitates replacement. Critical factors: ambient relative humidity, frequency of baths or showers, direct solar exposure, chemical products (soaps, sunscreens). Shell cordovan straps, owing to superior fibre density, may exceed 5–6 years. Ordinary maintenance (cleaning with damp cloth, conditioning with natural waxes every 18–24 months) significantly prolongs strap service life.