Strap for BC3 Day Date 42 Stainless Steel / Black / Bracelet

The lug width of the BC3 is 20 millimetres. This dimension represents the distance between the two spring bars of the case and determines which strap you can install. A 20mm strap will fit into this opening without forcing, ensuring a precise mechanical coupling and comfortable wearability. You can verify this measurement by consulting the warranty certificate or by physically measuring the distance between the lugs on your case.

The ideal strap depends on your use case and personal style. For formal wear, we recommend alligator leather hand-tinted in natural dyes or calf leather in vegetable tanning, in shades of dark brown or tobacco—these enhance the elegance of the stainless steel case. For daily sportive use, robust cotton NATO fabric or FKM rubber guarantee absolute practicality and moisture resistance. All MilanoStraps 20mm straps are 100% compatible with the BC3 standard lug width and can be customised online before ordering.

Change the strap using a spring bar tool (supplied with most watches) or by visiting a watchmaker. Position the watch on a soft surface with the lugs facing towards you. Insert the tip of the spring bar tool into the small hole of the lug retaining spring, applying gentle pressure to push the spring bar out. Repeat on the other lug. Insert the spring bars into the new strap and push gently until the spring clicks into place. Avoid excessive force to prevent scratching the case.

Yes, any strap with a 20mm lug width is perfectly compatible with the Oris BC3 01 635 7534 4164-07 8 20 69. MilanoStraps produces artisanal straps in leather, fabric and rubber, all tested for precise tolerances and mechanical coupling without play. We advise against low-quality straps, which may have imprecise tolerances and shed dye onto the case's steel.

A high-quality leather strap, such as those offered by MilanoStraps, maintains structural integrity for 3–5 years of daily wear with proper maintenance. Longevity depends on climate, humidity, frequency of wear and care. Leather tinted in vegetable tanning develops a protective patina that extends its life; industrially tinted leather tends to flake more quickly. Applying leather balm every 6–12 months and air-drying the strap after prolonged rain exposure ensures longevity. MilanoStraps offers buckle replacement and restoration services for vintage or worn straps.