Longines
Master Collection L2.919.4.97.— lug 21mm

The lug width of the L2.919.4.97. is precisely 21 mm. This measurement is determined by the 42 mm case geometry and remains constant across all examples. To verify, position a caliper on the spring bar holes and measure the internal distance.

A crocodile leather strap represents the most coherent choice for this dress-watch character. Crocodile in cognac brown or black offers understated elegance and develops a natural patina over time. Shell cordovan and vegetable-tanned calf leather are excellent alternatives for those seeking more personal materials.

The strap is secured to the case via removable spring bars. To change it: (1) position the watch on a soft cushion with dial facing down; (2) use a thin lever tool to press the internal spring mechanism of the upper bar whilst lifting the pin; (3) remove the pin completely; (4) repeat for the lower bar; (5) position the new strap and reinsert the bars in reverse order. If inexperienced, consult a professional to avoid case damage.

Yes, any strap with a 21 mm lug width is physically compatible. However, the strap must be constructed to fit perfectly with the case geometry without creating visible gaps between strap and case profile. Bespoke artisanal straps guarantee this aesthetic compatibility.

A quality leather strap (crocodile, calf, shell cordovan) typically lasts 3–5 years with standard daily wear. Durability depends on: wearing frequency, moisture exposure, perspiration and maintenance. Vegetable-tanned leather ages more elegantly but requires occasional light care. An 18-month warranty is standard for bespoke artisanal straps.