Strap for Master Collection Chronograph

The lug width of the Longines Master Collection L2.669.4.51.5 is 20mm. This specific dimension is calibrated to the proportion of the 39mm case and determines compatibility with aftermarket straps. To verify the measurement before purchasing, remove the original strap and measure the space between the lugs with callipers at the widest point where the spring bar passes through.

For the white dial and chronograph character of this model, we recommend an alligator strap with vegetable tanning in cognac brown or vegetable-tanned calf in natural shades. These materials enhance the aesthetic balance between the steel case and the complexity of the counters. A sportier alternative is vulcanised rubber with a canvas passant, ideal for daily wear thanks to water resistance and ease of cleaning.

Strap replacement requires a spring bar tool. Position the watch on a stable surface, insert the flat tip of the tool under the spring bar from the top of the lug, press gently to lift the bar, then slide the old strap out of its seat. Repeat on the other side. For fitting the new strap, align the strap holes with the lugs and press the bar until it clicks into place. If you prefer to avoid the risk, entrust the task to a Longines service centre.

All straps with a 20mm lug width are compatible with this model. At milanostraps.it you will find a complete selection of 20mm straps in leather, alligator, shell cordovan and synthetic materials, customisable in length, colour and details such as initials and stitching thread. Always check that the supplier guarantees precise tolerances on the spring bars for a gap-free fit.

Longevity depends on the material and usage. A quality artisan vegetable-tanned calf strap lasts an average of 3-5 years with daily wear before replacement is required, developing a fascinating patina over time. Vegetable-tanned alligator is more durable (5-7 years) and more stable in shape. Shell cordovan, if cared for, exceeds 10 years. Longevity is significantly extended if the strap is removed when not in use and protected from excessive moisture. Casati Milano offers an 18-month guarantee on custom-made atelier straps.