The Reference

Examined to the movement.

The Nautilus 5726A-001 is Patek Philippe's steel annual calendar with moon phase, part of the Nautilus line introduced in 1976 and photographed here in its November 2020 production. The 40.5mm steel case carries the signature Nautilus horizontal-lined grey dial, with the porthole-shaped bezel and integrated case flanks visible in the photos, paired with luminous baton hour markers and a day, month, and moon-phase display above a sub-dial date scale, plus a separate date window at six o'clock. Power comes from an automatic movement with a 45-hour power reserve and 34 jewels, visible through the sapphire caseback along with the gold Nautilus-motif rotor. The piece is fitted on a black leather strap with a steel clasp and remains sized as delivered from the factory at 40.5mm. New with Patek Philippe box and papers.

Reference details

Specifications

Brand
Patek Philippe
Reference
5726A-001
Year
2020
Movement
Automatic
Case size
40mm
Case material
Steel
Dial
Grey
Condition
Mint
Contents
Box
Delivery

Shipping

Every Palazzo watch ships fully insured and tracked — packed by hand in our Jersey City showroom and released only on your signature.

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Fully insured worldwide, with a signature required on delivery.
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Packed by hand in unbranded, tamper-evident packaging.
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Trading

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We send a prepaid, insured label to ship your trade safely.
Examined & documented
Authenticated by our watchmakers and photographed as a full set.
Paid within 24 hours
Paid within 24 hours of inspection.
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In our clients’ words

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I can't tell you how happy I am with Michael and the team at Palazzo Watches. I've been looking for a specific, very rare AP for a long time. Michael found one and worked with me every step of the way to get it into my hands. He was incredibly professional and accommodated every request and need I had. 10/10, will definitely be back for more.
The Watch MisterAug 5, 2026via Google
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I found my go to place to purchase luxury watches!! Mak and Michael were very professional, transparent, helpful, genuine and kind to me. They made the process of buying my first Rolex very easy. All their watches are authenticated with paperwork and box provided. Mak and Michael were very knowledgeable about each watch and answered all my questions to the fullest extent. I would 100% recommend anybody who is looking for their first or next piece in their collection to come here and purchase a watch.
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