Strap for Perpetual Calendar Split-Seconds Chronograph 5951P Silver

The lug width of the Patek Philippe Grand Complications 5951P-012 is 20 millimetres. This measurement is standard for watches of medium proportions and is essential to verify with a digital calliper before purchasing an aftermarket strap, ensuring perfect compatibility between the case lugs and the strap itself.

For the 5951P-012 in platinum with midnight blue dial, alligator remains the classical choice: its uniform grain and luminous patina pair perfectly with the brushed metal. Shell cordovan offers natural lustre that honours the technical complexity, whilst calf leather with vegetable tanning provides greater everyday versatility, developing a personal patina over time.

Changing the strap requires a specific tool: a spring bar tool. Insert the flat end of the tool into the slot of one lug, lift slightly until you hear a click, then remove the strap from the case. Repeat on the other side. To reinstall, align the holes of the new strap with the lugs and reinsert the spring bars using the same tool. If you do not possess the tool, entrust the service to an authorised service centre.

Yes, provided the strap is specifically constructed for 20mm lug width. Before ordering, verify the measurement declared by the manufacturer. Many bespoke artisanal strap makers, such as those available in the catalogue with 20mm specifications, offer construction quality equivalent to or superior to genuine Patek Philippe straps, with the advantage of choosing leather, colour and finishes according to your taste.

The lifespan of a leather strap depends on the material, use and maintenance. Quality alligator or shell cordovan, used occasionally, lasts 5-7 years. Calf with vegetable tanning, if exposed to regular use and moisture, requires replacement every 3-4 years. Frequent cleaning, sun exposure and perspiration accelerate ageing. With proper maintenance and storage in a dry environment, longevity increases significantly.