Strap for La Grande Classique Tonneau 22 Stainless Steel

The lug width of the Longines La Grande Classique L4.205.4.12.6 is 18 millimetres. This dimension is specific to this model and is determined by the proportions of the case, which measures 22.20 millimetres in diameter. To verify the correct measurement, you should measure the distance between the two internal lugs of the case (the insertion points for the spring bar) using a calliper or a millimetre ruler. It is essential that the measurement is precise to the millimetre before ordering an aftermarket strap.

The choice depends on your style and conditions of use. For maximum elegance, alligator represents the standard: its natural texture creates a sophisticated visual effect without excess. Quality calf leather, especially if treated with vegetable tanning, offers a patina that improves over time. Shell cordovan is reserved for those who appreciate longevity and aesthetic evolution of the material over decades. For casual daily use, a heavy-weight canvas NATO maintains proportionality. Rubber remains the most contemporary choice, indicated only for predominantly tech-forward styles. The finish of your dial should guide the colour decision: a cognac brown on a white dial, a pure black on a dark dial, a neutral grey for maximum versatility.

The procedure is identical to that of any watch with a spring bar system. Position the watch on a soft surface with the lower part of the case visible. Use a dedicated tool (spring bar removal tool) or a blunt watch knife end to gently push inward one of the spring bar ends, causing it to disengage. Repeat from the other side. Insert the new spring bars from your aftermarket strap into the same holes, pressing until you hear the click lock. Verify that the strap is perfectly centred and that both sides are securely anchored.

All standard 18-millimetre lug width straps are compatible with this model. Compatibility also extends to length variants (short, regular, long) as these depend on your wrist proportions, not on the case. On milanostraps.it you will find a complete selection of 18mm straps in various leathers (alligator, calf, shell cordovan) and colours, all customisable in sizes, initials and stitching thread. Quality aftermarket straps maintain the brand's construction standards, using spring bars of correct thickness and artisanal leather.

Durability depends on the material, construction quality and conditions of use. A good-quality calf leather strap with vegetable tanning lasts an average of 3–5 years if worn daily and subjected to normal conditions. Shell cordovan, thanks to its density and structure, can exceed 10–15 years of daily wear, developing an increasingly deeper patina. Alligator, if not subjected to excessive wear, maintains structural integrity for 5–8 years. Rubber remains virtually unalterable but loses resistance after 7–10 years of UV exposure. To extend durability, avoid prolonged water immersion (occasional contact is harmless) and occasionally apply a quality leather conditioner. Casati Milano offers an 18-month warranty on all bespoke straps made in the atelier.