Strap for Annual Calendar 4937 White Gold Diamond White Mother of Pearl

The lug width of the Patek Philippe Complications 4937G-001 is 18 millimetres. This measurement refers to the distance between the two spring bars that mount the strap into the case. To verify correctly, measure perpendicularly between the strap attachment points using a digital calliper. An incorrect measurement can prevent proper strap installation; we recommend double-checking before ordering.

For the 4937G-001, alligator leather represents the formal choice of choice, particularly in dark brown or black tones with satin finishing. Alternatively, vegetable-tanned calf leather offers versatility and develops a natural patina that registers the passage of time. We advise against shell cordovan as its intrinsic shine conflicts with the soft aesthetic of white gold.

The strap is changed using a dedicated spring bar tool to remove the fastening pins. Position the watch on a soft cloth to prevent scratches, locate the small lateral openings in the case where the pins are housed, and gently push the pin downward using the tool tip until the old strap is released. Insert the new strap by aligning the holes with the pins, then reinsert the pins. If you lack experience, consult an official service centre or Casati Milano for installation.

Yes, any strap with an 18mm lug width is mechanically compatible with the 4937G-001. Aesthetic compatibility, however, depends on the construction quality of the aftermarket strap. We recommend straps crafted in fine leather (alligator, vegetable-tanned calf) with refined finishing. Avoid low-quality industrial straps that compromise the tactile and visual perception of the watch. On milanostraps.it you will find 18mm straps selected for this model.

The durability of a leather strap depends on the material, construction quality, and usage patterns. Premium alligator leather lasts between 5 and 10 years with daily wear and moderate care. Vegetable-tanned calf, though more delicate, solidifies over time by developing a protective patina; it typically lasts 4-7 years. FKM rubber offers superior durability (7-12 years) owing to resistance to UV rays and moisture. Casati Milano provides an 18-month warranty on manufacturing defects for all custom-made straps.