Strap for Annual Calendar 5146 White Gold / Cream

The Patek Philippe Complications 5146G-001 features a lug width of 18mm. This measurement is taken between the internal terminals of the case and is determined by the proportions of the 39mm case diameter and 12mm thickness. Compatible straps must have a width of 18mm at the attachment points to fit without forcing or gaps.

For a formal timepiece in white gold with annual calendar complication, alligator remains the traditional choice: black for maximum sobriety, or cognac brown for tonal warmth with the case. Vegetable-tanned calf offers seasonal alternatives and develops patina over time. For those preferring superior durability, shell cordovan is excellent. Avoid NATO or rubber, which would diminish the formal character of the model.

Strap replacement is accomplished by removing the previous strap via the spring bars that connect the lugs to the case. A dedicated tool (spring bar tool) is used to compress the bars and slide the strap from the terminals. Once the lug is free, the new strap is inserted by aligning it with the holes of the spring bars and pressing until it engages. For valuable watches, consulting a certified watchmaker is advisable.

Yes, an aftermarket 18mm strap is compatible. The important factor is choosing a reliable manufacturer that guarantees precise tolerances and material quality (certified alligator, calf, or shell cordovan). Inexpensive or poor-quality straps may scratch the white gold lugs or loosen over time. Casati Milano manufactures artisanal 18mm straps tailored to this model with an 18-month warranty against manufacturing defects.

Longevity depends on usage, care, and leather quality. Alligator or calf from an artisanal manufacture, with ordinary maintenance (drying after humidity, storing in a dry place), lasts 3-5 years if worn daily. Shell cordovan, due to its superior density, can reach 5-7 years. Factors reducing lifespan include swimming pools, excessive perspiration, and repeated flexing. Casati Milano provides straps with construction quality that maximises longevity.