Patek Philippe
Complications 5905/1A-001
Patek Philippe Complications 5905/1A-001: strap made to measure on the watch at the Casati Milano atelier, by appointment.
Technical Specifications
Patek Philippe 5905/1A-0015905/1A-001
Patek Philippe caliber CH 28-520 QA 24H Day / Night Indication, Hours, Minutes | Annual Calendar, Date, Day, Month | Chronograph, Column wheel, Flyback
The Heritage
The strap for this watch is made to measure
On the Patek Philippe Complications the bracelet is drawn as part of the case: no catalogue strap will fit. In the atelier we take the measurements on the watch itself and build the strap on the piece — that is the work of Casati Milano.
Book a consultation →FAQ
Can a strap be fitted to the Patek Philippe Complications 5905/1A-001?
A standard strap with straight spring bars is not compatible with this model: the attachment is an integral part of the case design, with no conventional lugs. A strap can be obtained, built to measure directly on the watch by <a href="/pages/casati-booking">Casati Milano</a>, which takes the actual dimensions and designs every component for that specific piece.
How does the bespoke strap process work for the Patek Philippe Complications 5905/1A-001?
The process begins with an appointment at the atelier, where the craftsman receives the watch and studies the geometry of its attachment. All critical dimensions are taken by hand — head width, transition curves, bearing surface — and only from these real measurements is the strap constructed. Buckle, deployant clasp and keeper are chosen according to intended use and aesthetic preference.
Which leather suits the character of this watch?
Box calf with a fine grain is the most coherent choice: it holds its shape, develops a dense patina over time, and sits alongside steel without competing with it. Matt alligator is an alternative for those seeking more pronounced texture while maintaining chromatic restraint. Dark tones such as black, dark brown or anthracite respect the neutrality of the metal.
How long does a well-made bespoke strap last?
A strap built from first-quality leather, hand-stitched and edge-finished with natural wax, has a lifespan that depends primarily on use and care. With ordinary attention — avoiding prolonged contact with water, conditioning the leather periodically — a fine artisanal strap will accompany the watch for years, developing its own patina that enhances its character.
What makes the movement of the Patek Philippe Complications 5905/1A-001 particularly significant?
The CH 28-520 QA 24H calibre is one of the very few movements in the world to combine a column-wheel flyback chronograph with an annual calendar and a 24-hour day/night indication within a single manufacture movement. The annual calendar — a complication patented by Patek Philippe — automatically distinguishes between 30- and 31-day months, requiring only one manual correction per year, in February. The column wheel guarantees a quality of chronograph engagement and disengagement superior to any cam-based system.
The next step
The right strap isn’t chosen. It is built, together.
From the atelier appointment to delivery, every step is made for those who know that things done well take time. Rare leathers, one piece at a time, eighteen months of warranty.
Request an appointment →By appointment only · Milan
The atelier's website: casatimilano.com