Grail Watch Reference

A Reference Library for Watches from Grail Watch

  • Movement Database
  • Grail Watch Blog
  • The Watch Files Podcast
  • Reference Documents
  • About Grail Watch
  • Email
  • Instagram
  • LinkedIn
  • Twitter

Powered by Genesis

You are here: Home / Movements / Excelsior Park JB15

Excelsior Park JB15

Last Update: December 10, 2022

Brand:Excelsior Park
Family:
Unknown
Height:
Jewels:17
Reserve: hours
Frequency:18,000 A/h
Winding:Hand winding
Diameter:42 mm (18 ligne)
  Complications:5-Column Chronograph, Chronograph, Monopusher Chronograph
Hands:30 Minute Chronograph Hand at 3:00, Central 60 Second Chronograph Hand, Central Hour Hand, Central Minute Hand, Small Seconds Hand at 9:00
Distinguishing Technical Characteristics
Hand-Winding
Clockwise Balance Cock
Swan-Neck Regulator
5-Column Chronograph
Balance at 12:00
Column Wheel at 6:00
Production:  – 
1910s 1920s 1930s 1940s 1950s 1960s 1970s 1980s 1990s 2000s 2010s 2020s
This watch features the optional hacking switch

Cal. JB15 is an 18-19 ligne chronograph movement produced by Excelsior Park (Jeanneret-Brehm) since the 1930s. It was an advanced movement with fine components and was anti-magnetic. The movement stop/start/reset is controlled by a button co-axial with the crown. Some examples include a sliding lever to stop the hands during operation (hacking). The movement was variously listed as 18, 18.5, and 19 ligne in diameter. A 24 ligne version was also offered.

Cal. JB15 is fitted with a Jeanneret family signature feature: A compartment in the movement holds a collection of spare parts including a balance wheel and jewels.

This 1931 ad shows the new Cal. JB15

A rattrapante version of Cal. JB15 was also produced. It featured a pushbutton 1 hour counter-clockwise from the crown (typically at 11) to operate the flyback hand.

The movement is seen in a 1931 advertisement and is listed then as “Nouveau chronographe”, suggesting recent introduction. It still appears in the Excelsior Park catalog in 1950.

Images are taken from official publications and are used here for commentary and educational purposes. Copyright is held by the original owner as noted.

Related Posts

Chronoswiss C.125

Excelsior Park JB4-24h

ETA 2894-2

ETA 2893-2

Chronoswiss C.124

ETA 7754