Strap for Flagship 35.6 Automatic Pink Gold

The lug width of the Longines Flagship L4.774.8.21.2 is 18.00 millimetres (lug width 18 mm). This dimension is measured from the inner shoulder of one lug to the other, excluding the thickness of the spring bar itself. Manufacturing tolerance: ±0.3 mm. This specification is essential to ensure proper seating of the strap without play or compression.

For the rose gold Flagship, we recommend genuine alligator in cognac or dark brown tones (fine grain), vegetable-tanned calf in grey-taupe, or shell cordovan for exceptional longevity. Each material develops a patina over time, complementary to the warm chromatic character of rose gold. For sporty use, vulcanised rubber in grey-stone or cotton NATO fabric offer contrast without aesthetic compromise.

Strap replacement is carried out by extracting the lateral spring bars from the lugs. Use a dedicated tool (spring bar tool or lever) to decompress the internal spring and slide the bar out of its seat. Insert the new strap, aligning the lug width with the lug hole, and slide the spring bar until it locks securely. The operation is straightforward but requires care to avoid scratching the case. If uncertain, Casati Milano provides this service by appointment.

Yes, any artisanal strap manufactured to 18 mm lug width specification is compatible. Compatibility is guaranteed by standardisation: 18 mm internal width, strap thickness in line with specifications. Verify with the manufacturer that the lug width conforms to the 18 mm standard. Milano Straps and the Casati Milano atelier certify complete compatibility for every strap sold to this specification.

A natural leather strap (alligator, calf, shell cordovan) with vegetable tanning lasts 3–5 years with daily wear, up to 7–10 years if worn intermittently. Longevity depends on frequency of use, climate (humidity is damaging), and maintenance (periodic cleaning with a damp cloth, annual conditioning with neutral creams). Shell cordovan exceeds these timescales due to material density. The patina that develops is a sign of natural ageing, not deterioration.