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The Encyclopedia of Horology

Wristwatch · Moon phase calendar wristwatch

Patek Philippe Neptune Moon Phase Ref. 5085/1A

Partially verified

The Patek Philippe Neptune ref. 5085/1A is a stainless steel automatic wristwatch manufactured in the 2000s. The watch features a 37mm diameter case with integrated crown guards, a screw-down crown, and an exhibition sapphire case back. The timepiece is powered by the in-house caliber 240/164, which drives a moon phase display, a calendar, and a power reserve indicator. It is fitted with an integrated stainless steel bracelet featuring a "fish scales" link design and a butterfly clasp. The dial is finished in satin black with luminous hour markers and hands. This specific example is supplied with its original inner and outer boxes, Certificate of Origin, a leather document holder, setting pusher, travel pouch, and instruction booklets. The vendor reports that the watch retains its original dimensions and components.

Front view of the Patek Philippe Neptune Ref. 5085/1A showing the satin black dial, moon phase, and integrated bracelet.
Front view of the Patek Philippe Neptune Ref. 5085/1A showing the satin black dial, moon phase, and integrated bracelet. — Craft & Tailored. Rights pending — permission not yet requested. Original source

Catalogue identity

Source
craftandtailored.com
Category
Wristwatch · Moon phase calendar wristwatch
Maker / attribution
Patek Philippe
Reference
5085/1A
Catalogue / lot identifier
PPN5085A
Source-reported date
2000s
Source-reported place
Switzerland
Source-reported serial
31XXXXX / 41XXXXX

Source-reported attribution and specifications are not independent authentication. A listing does not establish present ownership, current display, availability or permission to reproduce.

Object description

Case and Bracelet

The stainless steel case measures 37mm in diameter and is designed with integrated crown guards and a screw-down crown. According to the auction description, the case retains its original dimensions and exhibits minimal signs of previous polishing. A domed sapphire crystal protects the dial, while the reverse side features a sapphire exhibition window to view the movement. The watch is rated for a depth of 30 meters.

The watch is secured by an integrated stainless steel bracelet featuring a 'fish scales' link construction and a butterfly clasp. The bracelet is reported to be in good condition with nominal stretch and contains 18 links, sized to fit a wrist up to 7 1/4 inches. The screw-down crown is marked with the Patek Philippe cross emblem.

Evidence for this section
  • “stainless steel 37mm case with crown guards and a screw-down crown resulting in a 30-meter depth rating”
  • “integrated stainless steel "fish scales" bracelet with butterfly clasp”
  • “case retains its orignal screw-down crown adorned with the Patek Philippe cross”

Movement and Dial

The timepiece is powered by the in-house caliber 240/164, which is visible through the exhibition case back. The functions include a moon phase indicator, a calendar display, and a power reserve gauge. The caliber 240/164 is a self-winding movement specific to this reference.

The dial is a satin black color and features tritium-based luminous plots and hands. The vendor reports that the dial is free of age or damage, and the luminous material shows no signs of degradation under UV light. The luminous plots have developed a golden patina, while the hands appear slightly lighter in shade than the markers on the dial.

Evidence for this section
  • “employing the in house cal. 240/164”
  • “original satin black dial is virtually flawless”
  • “tritium lume plots have achieved a vibrant golden patina”

Provenance and Accessories

The Neptune model was originally introduced in 1996 and was subsequently discontinued in 2005. This specific item is a ref. 5085/1A, which the vendor identifies as the 'halo reference' for the series due to the moon phase complication.

The set is provided with a full suite of original accessories. This includes the inner and outer presentation boxes, the Certificate of Origin, a leather document folder, and instruction manuals. Additionally, a setting pusher and a travel pouch are included in the package.

Evidence for this section
  • “watch comes complete with its original inner and outer boxes, Certificate of Origin, leather document holder, instruction booklets, setting pusher, and a travel pouch.”

Open research questions

  • What is the specific production year for the masked serial number ranges?
  • Are there variations in the 240/164 caliber observed across the production run of the 5085/1A?

Source evidence

Recorded claims and source quotations for Patek Philippe Neptune Moon Phase Ref. 5085/1A
FieldSource-reported valueSource quotation
MakerPatek Philippe“Patek Philippe”
Reference5085/1A“5085/1A”
Movementcal. 240/164“in house cal. 240/164”
Case materialStainless Steel“stainless steel 37mm case”
Depth rating30 meters“30-meter depth rating”
Bracelet typeIntegrated stainless steel 'fish scales'“integrated stainless steel "fish scales" bracelet”
Dial colorBlack“satin black dial”
Discontinuation date2005“discontinued in 2005”

Visible details

  • Satin black dial with moon phase display
  • Integrated 'fish scales' stainless steel bracelet
  • Exhibition sapphire case back revealing movement
  • Screw-down crown with cross emblem

Research qualifications

  • Service history is unknown
  • Full serial number is partially masked by the vendor

Photograph identity and source facts were screened before import; rights clearance remains pending.

Consulted source

ساعت مچی Patek Philippe Neptune Moon Phase رفرنس 5085/1A

Reviewed 2026-11-02 · Record a10bc01dbf

Terms in this record

Glossary explanations for terms named in this object’s record.