Strap for Presence 34.5 Automatic Gold

The lug width of the Longines Presence L4.778.6.11.2 is exactly 18 mm. This dimension is specific to this generation of the model and is relatively uncommon in the contemporary market, where 20, 22, and 24 mm dominate. To measure accurately, observe the gap between the case lugs where the strap is inserted: it must measure 18 mm from outer edge to outer edge.

For a timepiece of this proportion and tonal elegance, alligator with fine grain is the most sophisticated choice: the natural texture does not compete with the yellow gold case. Alternatively, vegetable-tanned calf offers a more expressive texture and develops patina over time. For those prioritising practicality, technical rubber resists water immersion. Shell cordovan, though rare in 18 mm, represents the ultimate luxury option with natural ageing characteristics.

The Presence strap is changed via spring bars—the small metal pins that connect the strap to the case lugs. Using a spring bar remover tool, gently press one end of the pin to disengage it, then extract it. Repeat for the second pin. Align the new strap's holes with the lug apertures and push the spring bars into position until you feel them click into place. If you prefer not to risk it, entrust the operation to a professional watchmaker.

Yes, provided the strap is constructed for the 18 mm lug width specification. A quality aftermarket strap permits stylistic variation without functional compromise. Always verify that the inner diameter of the passants corresponds exactly to 18 mm and that the spring bars are compatible. Specialist manufacturers offer 18 mm straps in alligator, calf, and rubber, often with bespoke customisation available.

The lifespan of a leather strap on the Presence depends on material grade and usage patterns. Premium alligator lasts 3–5 years with daily wear, whilst vegetable-tanned calf tends to show fatigue sooner (2–4 years) but develops a coveted patina. Shell cordovan is notably durable and may serve 5–7 years. Exposure to sunlight, moisture, and perspiration accelerates deterioration. Regular maintenance with specialist creams substantially extends strap longevity.