Strap for Divers Sixty-Five 40 Ctime Limited Edition

The Oris Divers 65 01 733 7707 4397-Set features 20-millimetre lugs. This measurement, expressed as the inner distance between pins, is standard in professional dive watches and ensures compatibility with all straps certified for this dimension. To verify the measurement, place a rigid ruler perpendicular to the case lugs, measuring the internal distance.

Selection depends on intended use. For formal elegance: vegetable-tanned leather or alligator in dark brown. For marine operation: NATO in ballistic nylon or Fluoroelastomer rubber. The case bronze dialogues naturally with burnished or cinnamon leather; vegetable tanned calf with tannin tanning develops a patina that evolves over time. For regular diving, rubber is the superior technical choice: it maintains flexibility at low marine temperatures and resists salt water corrosion.

Strap replacement requires a spring bar tool. Insert the flat tip into the lateral slot of the pin, gently lifting until one end of the pin is released from its seat. Repeat on the other side. Remove the pin completely. Position the new strap on the lugs, reinsert the pin through the first lug, gently lower until the second lug seat engages, and secure. Verify that the pin is fully locked on both sides before wear.

Yes, any strap with 20-millimetre lugs is compatible. Verify that strap thickness at the lug area does not exceed 4-5 millimetres (bronze and stainless steel construction tolerates minimal variation). Artisanal straps with stainless steel pins and deployant buckles are preferable: they ensure durability and do not scratch the bronze case. Avoid straps with rough finishes that might oxidise the bronze.

A vegetable-tanned leather strap on a diver experiences greater stress than formal watch straps: humidity, sodium chloride (salt water), and UV exposure. With tannin tanning and hydrophobic treatment, expected lifespan is 3-4 years with moderate use (1-2 swims weekly). NATO or Fluoroelastomer rubber straps offer greater longevity (5-7 years) because they do not degrade with water exposure. Recommendation: rotate straps every 2-3 months during regular diver use, allowing complete drying between uses.