Strap for Master Collection 42 Chronograph Calendar Stainless Steel / Silver

The lug width of the Longines Master Collection L2.773.4.71.2 is 21mm. This measurement is taken between the two lugs (spring bar seats) of the case and accommodates generous straps crafted from noble leathers. To verify the correct dimension, use a calliper positioned internally between the two case protrusions.

For the Master Collection L2.773.4.71.2, we recommend straps crafted from superior alligator leather (featuring fine grain and natural patina development), vegetable-tanned calf, or technical NATO fabric for more sportive wear. Alligator remains the ideal choice: its uniform texture and capacity to develop subtle colour shifts over time complement the sober technical character of this chronograph. For colour combinations, consider black, dark brown, or tobacco tones.

The strap is changed using a spring bar tool to remove the elastic pins (spring bars) that connect the strap to the case lugs. Position the tool in the small notch beneath the lug, press gently to retract the spring, and push the strap downward to release it. Repeat on the opposite side. To install the new strap, align the holes with the lug position and push upward until you hear the spring bar click into place.

Yes, absolutely. Aftermarket 21mm straps are fully compatible with the Master Collection L2.773.4.71.2, provided the lug width is exact and the strap is dimensioned correctly (internal width appropriate to the case protrusions). Milano Straps offers a curated selection of artisanal straps in 21mm crafted from noble leathers, customisable in colour, measurement, and stitching details.

A superior quality leather strap (alligator with vegetable tanning, or vegetable-tanned calf) has an average lifespan of 5–8 years of regular wear, provided exposure to moisture is controlled and periodic maintenance is performed (gentle cleaning and conditioning with specialised products). Durability increases if the watch is not worn daily. Milano Straps straps are guaranteed for 18 months and crafted from leather selections prized for durability and elegant natural ageing.