Strap for BR 03 90 Grande Date & Reserve de Marche

The Bell & Ross BR-03 BR0390BLST features a 20mm lug width. This measurement is the standard for this specific model and determines compatibility with aftermarket straps. To verify, measure the distance between the inner lugs where the spring bars anchor. Milano Straps offers a comprehensive selection of 20mm straps tested for both mechanical fit and aesthetic proportions.

The choice depends on your usage patterns and aesthetic preferences. An alligator strap with vegetable tanning emphasises the formal character and quadratic geometry of the case. Grain leather offers sobriety and versatility. A rubber or fabric NATO strap preserves the avionic identity and guarantees maximum practicality. For a personalised experience, Casati Milano crafts bespoke straps, allowing you to select leather, thickness, and finishes according to your style.

Remove the spring bars from the case lugs using a dedicated tool (spring bar tool) or consult a qualified watchmaker. Extract the previous strap, align the new strap holes with the lug anchors, and reposition the spring bars. Ensure the bars are fully seated in the lugs to prevent movement. Casati Milano can assist in the process or apply the new strap directly for you.

Yes, any strap with a 20mm lug width is mechanically compatible. However, true compatibility includes proper aesthetic proportions: the strap must have appropriate thickness and length for your wrist. Milano Straps curates 20mm straps specifically chosen to balance the 42mm case of the BR0390BLST, and Casati Milano customises length and configuration based on your anatomy.

A quality leather strap—alligator, calf, or shell cordovan—lasts 3–5 years with ordinary care, depending on usage intensity and climatic conditions. Vegetable-tanned leather, whilst requiring greater attention to humidity, develops a rich patina over time. Milano Straps' straps are crafted from premium hides and guaranteed for 18 months. Casati Milano recommends regular cleaning and conditioning to extend longevity.