Minerva 19/9

	Brand:	Minerva
	Family:	Unknown
	Height:	5.45 mm
	Jewels:	7, 15
	Reserve:	hours
	Frequency:	18,000 A/h
	Winding:	Hand winding
	Diameter:	42.15 mm (19 ligne)
	Complications:
	Hands:	Central Hour Hand, Central Minute Hand

Distinguishing Technical Characteristics
Hand-Winding Clockwise Balance Cock Indexed Regulator Balance at 12:00 Barrel at 7:30
Production: 1908 –
1910s	1920s	1930s	1940s	1950s	1960s	1970s	1980s	1990s	2000s	2010s	2020s

Cal. 9 is a 19 ligne stem winding and setting open-faced pocket watch movement from Robert Frères (later called Minerva). It was descended from Cal. 19/3, the company’s first stem-set movement, and shared many features. It also shares its basic design with Cal. 19/27. Cal. 9 was introduced around 1908 and remained in production through the 1940s.

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

Ranfft Pink Pages