Strap for Master Collection Date 29 Stainless Steel

The lug width of this Longines is 15 millimetres. This narrow dimension is specific to the model and essential for proper strap fitting. A 15mm lug width ensures the strap adapts perfectly to the spring bar seats without play or forcing. Measurement should be taken between the inner edges of the lugs, where the spring bars are inserted.

Choice depends on intended use and personal preference. For formal occasions, polished black alligator maintains the watch's discreet elegance. Shell cordovan from horsehide represents a premium option that develops a rich patina over time. For daily wear, vegetable-tanned calf offers softness and breathability, acquiring a fascinating patina with wear. A fabric NATO is perfect for summer seasons and informal weekends.

Strap replacement requires a specific tool called a spring bar remover. Position the watch on a clean surface, locate the small spring hook inside one of the lugs and gently press downward. The spring bar will exit its seat. Repeat the operation on the other side. You can now remove the old strap and insert the new one into the lugs, ensuring the spring bars click securely in both seats.

Yes, several high-quality aftermarket options exist. Milano Straps catalogues 15mm straps compatible with this model, available in various materials: alligator, calf leather, shell cordovan and technical fabrics. These straps are customisable in length and finishing, ensuring perfect fit and allowing you to choose the material and colour that best suits your style.

Durability depends on material and usage. A high-quality alligator or shell cordovan strap can last 5-7 years with regular maintenance and daily wear. Vegetable-tanned calf, being softer, tends to wear faster but ages beautifully, requiring replacement after 3-5 years. Fabric NATOs are more resistant to mechanical wear but may deteriorate sooner in constant friction environments. Proper care—cleaning, drying after perspiration, seasonal conditioning—significantly extends the life of any strap.