IWC
Da Vinci IW3736-13— lug 15mm

The lug width of the IWC Da Vinci IW3736-13 is precisely 15 millimetres. This dimension is specific to this model and derives from IWC's proportional calculations applied to the tonneau case measuring 29mm. To verify correct measurement, use a digital calliper positioned perpendicularly between the internal points of both lugs. Any strap installed must conform exactly to this measurement to ensure functional and aesthetic compatibility.

For the Da Vinci IW3736-13, hand-worked alligator represents the premier choice: its regular grain and silky character create fascinating contrast with the tonneau geometry of the case. Mocha or cognac calf offers understated elegance for corporate contexts, while vegetable-tanned leather guarantees superior environmental resistance and visibly noble ageing. NATO fabrics permit bold chromatic interpretations whilst maintaining daily practicality. Your choice depends on usage: formal-daily suggests alligator or calf; sport-versatile inclines toward NATO or foam rubber.

Changing the Da Vinci IW3736-13 strap requires care given the 29mm tonneau case. Use a high-quality spring bar tool, positioning it from beneath the lug at a precise 45-degree angle to compress the spring without scratching the surfaces. Extract the old strap by gently pushing outward, then insert the new one with attention to curvature geometry. If inexperienced, we recommend entrusting the operation to a specialist atelier such as Casati Milano: the cost is minimal compared to the risk of case damage.

All straps designed for 15mm lug width are compatible with the IW3736-13. On milanostraps.it you will find a dedicated collection of straps in alligator, calf, vegetable-tanned leather, NATO fabric and rubber, customisable in precise measurements and aesthetic details (stitching thread, initials). The important thing is to verify that the strap is explicitly declared for 15mm attachments. Avoid generic straps: they might generate unwanted play or installation difficulties.

A quality leather strap on an IW3736-13 lasts approximately 3–5 years with moderate daily use (five days weekly). Lifespan varies significantly depending on material: alligator tends toward 5–7 years thanks to grain density; calf, more vulnerable to impacts, might require replacement at 3–4 years; vegetable-tanned leather, hand-worked, evolves aesthetically for 7–8 years before showing structural breakdown. Exposure to perspiration, humidity and UV rays accelerates ageing. Casati Milano straps include 18-month warranty and can be regenerated through reconditioning interventions.