Strap for Big Bubble Magical 52 Titanium / Nelson de la Nuez / Rubber

The lug width of the Corum Bubble L390/03635 is 27mm. This is the space between the inner pins of the case attachments and determines compatibility with all aftermarket straps. It is essential to measure correctly with a digital calliper positioned between the lugs to avoid ordering errors.

For the Bubble L390/03635, we recommend natural or fumé alligator to maximise sophistication, or vegetable-tanned calf leather to introduce organic warmth. NATO straps in charcoal grey represent an effective urban alternative, whilst brushed rubber materials create fascinating contrast with the titanium case. Optimal thickness remains between 4.5 and 5.5mm.

To change the strap, remove the spring bars with a dedicated tool (spring bar remover) applying gentle inward pressure. Once extracted, the pins can be reused on any 27mm strap. Insert the new strap gently, aligning one end first, then push into position until the click engages. Avoid forcing; movement should be fluid.

Yes, all straps with 27mm lug width are compatible. Milano Straps offers a specialised collection in this size, from fine leather to NATO and FKM rubber straps. Always verify the strap is measured for 27mm and do not confuse this measurement with case diameter, which on the Bubble is 52mm.

A fine leather strap (alligator or vegetable-tanned calf) typically lasts 3-5 years with daily wear, accounting for natural wear at the adjustment holes. Durability depends on sun exposure, humidity and frequency of use. The patina that develops is a sign of authenticity. NATO and rubber straps have similar lifespans, with enhanced resistance advantages in humid environments.