Minerva 19/9 CH

	Brand:	Minerva
	Family:	Unknown
	Height:	7.60 mm
	Jewels:	17
	Reserve:	32 hours
	Frequency:	18,000 A/h
	Winding:	Hand winding
	Diameter:	42.15 mm (19 ligne)
	Complications:	6-Column Chronograph, 7-Column Chronograph, Chronograph, Column Wheel 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 6-Column Chronograph 7-Column Chronograph Balance at 12:00 Column Wheel at 6:00
Production: 1908 –
1910s	1920s	1930s	1940s	1950s	1960s	1970s	1980s	1990s	2000s	2010s	2020s

Cal. 9 CH is a 19 ligne chronograph pocket watch movement from Robert Frères (later called Minerva). It was descended from Cal. 19/3, the company’s first stem-set movement, and shares with the time-only Cal. 9 and Cal. 19/27. It was introduced around 1908 and remained in production through the 1940s.

The company calls it “Chronographe-Compteur Calibre 19/9 CH” in data sheets. It was produced in monopusher (with 6 columns) or 2-pusher (with 7 columns) versions as well as with 30 or 45 minute counters. A non-chronograph version is simply called Cal. 9 or Cal. 19/9.

One distinctive element of the movement is the u-shaped arm for the oscillating pinion, which is unlike anything on any other movement. This makes Cal. 19/9 CH instantly recognizable.

Cal. 3 spawned a range of related pocket watch movements:

Ranfft Pink Pages