Blancpain JB 1735 Chronographe Rattrapante Calendrier Perpétuel

Technical characteristics

Type

Split-seconds chronograph with perpetual calendar

Maker

Blancpain

Diameter

34 mm

Functions

Split-second chronograph, perpetual calendar, moon phases

Reference

5581

Case Material

18K pink gold and platinum

Movement Type

Automatic, Cal. 5581

Production Date

1990s

Maker / attribution

Blancpain

Design

Case and Dial

The watch features a three-body, bicolored case construction. It combines a polished pink gold stepped bezel with platinum case and lugs. The case is protected by a sapphire crystal and measures 34 mm in diameter. The overall design aesthetic is defined by the contrast between the pink gold and the platinum components. The ivory-colored dial is appointed with applied pink gold radial Roman numerals. It includes auxiliary dials for the 12-hour and 30-minute chronograph registers, and indications for the days of the month, days of the week, months, and leap year. A sector is graduated for the age of the moon, accompanied by an aperture for the moon phases. Time is indicated by tritium-coated pink gold Bâton hands.

Visible features

• Bicolored case with pink gold bezel and platinum lugs • Ivory dial with Roman numerals • Split-second chronograph pusher located at 10 o'clock • Moon phase display at the 6 o'clock position

Provenance and Series

This watch is identified as the first piece from a three-precious-metals set, marked as No. 1. It belongs to the Harmony of Time series, which the auction house states was created as a tribute to Jehan-Jacques Blancpain, the firm's founder in 1735. The watch is described as a very fine and rare astronomic wristwatch.

Movement and Functionality

The timepiece is powered by the Blancpain Caliber 5581 movement. It is a rhodium-plated mechanism featuring fausses côtes decoration and containing 28 jewels. The movement is equipped with a straight line lever escapement, a shock-absorber, and a self-compensating flat balance-spring. The monometallic balance is adjusted to five positions. Functionality includes a split-second chronograph operated by a pusher on the side of the case at the 10 o'clock position, which controls the stop and reunite function for the split-second hand. The movement provides for astronomical displays including the perpetual calendar and phases of the moon. All major components are signed.

Identification

Reference

5581

Serial number

No. 1

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.