Strap for Prestige Gold 21

The lug width of the Longines L4.228.6.85.6 is 20 millimetres. This measurement represents the distance between the inner shoulders of the case lugs where the strap is fitted. To verify, measure with a digital calliper from inner wall to inner wall of the lug, perpendicular to the case. It is essential to respect this exact measurement to ensure precise installation and mechanical stability without play.

For a model of this standing, alligator leather with vegetable tanning represents the most coherent choice for the classical style and elegance of the yellow gold case. Alligator develops a natural patina over time that mirrors the ageing of the precious metal. However, regenerated calf leather with vegetable tanning offers superior comfort and simpler maintenance, whilst shell cordovan guarantees extraordinary durability and natural lustre ideal for intensive daily use. The choice depends on intended use and personal aesthetic preferences.

To change the strap, remove the spring bars (push-pins) from the case lugs with care. Tilt the strap slightly downwards to release one spring bar at a time, using a flat tool (bone stiffener or dedicated removal tool) to push the spring mechanism. Once both lugs are released, remove the old strap. Insert the new strap by aligning the lugs precisely with the spring bars, then press upwards until you hear a click of engagement. Verify that the strap is secured correctly by pulling gently downwards.

Yes, any strap with a 20mm lug width is compatible with the Longines L4.228.6.85.6. Quality aftermarket straps guarantee artisanal finishing, choice of premium leathers and customisation (initials, stitching thread, length). On milanostraps.it you will find 20mm straps in alligator, calf, shell cordovan and specialist materials ready for immediate dispatch, or customisable through Casati Milano atelier with direct consultation and 18-month warranty.

Durability depends on material and intensity of use. A quality alligator or calf strap with proper vegetable tanning lasts an average of 3–5 years with moderate daily use. Shell cordovan, thanks to fibre density, can last 5–7 years or more with periodic maintenance (gentle cleaning, annual protective treatment). A strap exposed to constant moisture, excessive heat or intensive mechanical stress requires premature replacement. Regular maintenance (drying after water contact, storage in a temperate environment) significantly extends the life of the strap.