Family: 99221 jewels
992 with Elinvar hairspring (nickel-iron alloy, temperature-compensated). Railroad grade. 21 jewels. 16 size.
TECHNICAL SPECIFICATIONS
Movement Type
Manual Winding
Jewel Count
21 jewels
Display Type
Analog
QUICK FACTS
BRAND
TYPE
Manual WindingSTATUS
DiscontinuedMANUFACTURE
In-houseLAUNCH YEAR
1912BASED ON
Hamilton 992CALIBER FAMILY
992ALSO KNOWN AS
elinvar