Strap for Step One Chronograph Stainless Steel / Black

The lug width of the L & Jr Step One S1502 is 20mm. This measurement is taken between the lugs (attachment points on the watch case) using a digital calliper, excluding any decorative protrusions. It is essential to verify this measurement precisely before purchasing an aftermarket strap to ensure complete compatibility.

The best strap depends on intended use. For formal and smart-casual contexts, cognac alligator or vegetable-tanned calf leather emphasise the geometric sobriety of the case. For daily sportive use, a NATO in navy blue or grey maintains visual coherence with practicality. FKM rubber is ideal for aquatic environments. Avoid pastel colourways that would conflict with the austere design philosophy.

The strap is changed by removing the spring bars (horizontal metal pins connecting the strap to the case). Using a dedicated spring bar tool, apply pressure inward to release one pin, slide the strap free, and repeat on the opposite side. The new strap is inserted in reverse, ensuring both pins click securely into position. This operation requires only seconds of practice.

Yes, all straps catalogued for 20mm lug width are compatible with the S1502, as the lug attachment width is standardised. Milano Straps organises its offering by precise lug width, eliminating sizing errors. Before ordering, it is always advisable to measure your own case independently to rule out rare manufacturing variations on individual examples.

A quality leather strap (alligator or vegetable-tanned calf) typically lasts 3–5 years with daily wear, depending on ambient humidity, maintenance frequency, and sun exposure. The leather gradually thins, with failure typically occurring near the buckle or lugs. Occasional applications of mink oil extend useful life. NATO and FKM rubber straps offer greater durability, lasting 7–10 years.