Strap for Saint-Imier Chronograph

The Longines Saint Imier L2.784.4.72.0 features a lug width of 20mm. This dimension represents the distance between the case lugs and determines the width of compatible straps. To verify correct measurement, measure the internal space between the two lug holes: it should be exactly 20 millimetres. It is also important to check that the strap is constructed to fit properly in this configuration, without play or excessive tension.

For the 43mm L2.784.4.72.0 model, we recommend straps in black alligator for sober elegance, calf leather with vegetable tanning in dark brown tones for everyday versatility, or black technical rubber for the sportier variant. Alligator enhances the brushed finish of the case, vegetable-tanned calf develops patina over time and imparts warmth, whilst rubber offers durability and practicality. Your choice depends on intended use: elegant in alligator, versatile in calf, sporty in rubber.

To change the strap, you must remove the side lugs. Use a dedicated tool to extract the lug pins (a small brass tool or spring bar tool works well). Place the watch on a soft surface, inverted, and gently push the pin from the inside outward, using the tool as leverage. Once the pin is extracted, the lug will separate from the case. Repeat on the opposite side. Insert the new strap by aligning the passant holes with the pins, then reinsert the pins by pushing until they click into place.

Yes, the L2.784.4.72.0 is fully compatible with quality artisanal aftermarket straps featuring 20mm lugs. Artisanal straps offer greater variety in materials (alligator, shell cordovan, vegetable-tanned calf) and customisation (initials, colours, stitching thread). Ensure that the strap is constructed to properly accommodate your case pins without excessive tension. Specialised brands such as Milano Straps guarantee compatibility and solid construction.

The lifespan of a leather strap depends on material and usage. Quality calf with vegetable tanning typically lasts 3–5 years with daily wear, developing natural patina. Alligator, being more compact, can reach 5–7 years. Technical rubber exceeds 10 years. Factors that reduce lifespan include prolonged sun exposure, saline perspiration, excessive moisture, and constant tension in the passant areas. To extend strap life, dry it if wet, expose moderately to sunlight, and alternate with other straps to distribute wear. Artisanal warranty (18 months) covers manufacturing defects, not natural wear.