Patek Philippe Ref. 3970ER Perpetual Calendar Chronograph
Record status
Individual type · partial
Period
1991
Maker / issuer
Patek PhilippeThis Patek Philippe wristwatch, reference 3970ER, is a second-series perpetual calendar chronograph encased in 18k pink gold. Featuring a 36mm case manufactured by Ateliers Réunis, the watch houses the manual-winding calibre CH 27-70 Q, which is based on a Lemania ébauche.
The argenté dial displays a complex array of functions including chronograph counters, a perpetual calendar, and a moon phase indicator, all accented by feuille hands. The typography on the dial is noted as American Typewriter style. Produced in a limited quantity within the series, the watch is accompanied by a full set of original documents.
Evidence at a glance
- Linked sources
- 1
- Photograph views
- 1
- Catalogue references
- 0
Counts describe this entry’s documentation, not authenticity, rarity or completeness. Photographs may show one specimen; check each caption and licence.
Technical characteristics
- Type
- Perpetual calendar chronograph
- Maker
- Patek Philippe
- Calibre
- CH 27-70 Q
- Material
- 18k Pink Gold
- Reference
- 3970ER
- Case Maker
- Ateliers Réunis
- Complications
- Chronograph, perpetual calendar, moon phase
- Place recorded
- Switzerland
- Maker / attribution
- Patek Philippe
Design
- Movement
- The movement powering this watch is the Patek Philippe calibre CH 27-70 Q. This movement is based on a Lemania ébauche and integrates a column-wheel chronograph with a perpetual calendar module. The movement exhibits traditional finishing techniques, including anglage on the bridge edges and decorative patterns on the plates. The movement architecture serves to provide comprehensive calendar and chronograph data within a standard case diameter.
- Case and Dial
- The reference 3970ER features a 36mm case constructed from 18k pink gold. The case production is attributed to Ateliers Réunis, a workshop documented as a specialist in Patek Philippe case manufacturing. The argenté dial presents a warmer silver tone and utilizes feuille-style hands for time indication. The dial layout includes sub-dials for the perpetual calendar and chronograph functions, alongside a moon phase aperture. The font style used for the numerals is identified as American Typewriter.
- Visible features
- • Case diameter is 36mm in 18k pink gold • Dial features feuille hands and moon phase display • Calibre CH 27-70 Q movement visible with anglage • Includes leather strap
- Provenance and Documentation
- This watch is offered as a full set, including original manufacturer documentation. The papers indicate an original date of sale of March 6, 1991, from a Patek Philippe establishment. The source notes that this specific reference and metal combination is rare, with estimated production figures for the pink gold version being approximately 60 pieces out of a total 650 examples produced for the second series.
Identification
- Reference
- 3970ER
- Source note
- Facts transcribed from the linked source listing or collection record. Attribution and specifications are source-reported and have not been independently authenticated.
Catalogue references
No catalogue numbers recorded. Numbers are only published once transcribed from a verified edition of a standard catalogue — they are never inferred.
Research required
- Research required: Total production numbers are estimates provided by the source
- Research required: Service history details are not provided in the source