Swiss automatic movement introduced around 1955-1960 with several innovative features. Built on the manual-wind Felsa 4010 base with a piggybacked self-winding module. First Felsa to use a rocking bar changer for bidirectional winding. Features nickel screw balance with swan neck regulator. Available in elaborate versions with up to 35 jewels using KIF-Duofix bearings throughout. Widely rebadged including as Elgin 813. Related calibers include 4005, 4007 (with date), and 4010 (manual base).
Movement Type
Automatic
Jewel Count
17 jewels
Power Reserve
42h
Frequency
18,000 vph (5 Hz)
Diameter
25.6mm
Height
5.8mm
Display Type
Analog
Rotor Type
bidirectional
Shock Protection
Incabloc
BRAND
FelsaTYPE
AutomaticSTATUS
DiscontinuedMANUFACTURE
ÉbaucheLAUNCH YEAR
1955CALIBER FAMILY
4000COUNTRY
SwitzerlandALSO KNOWN AS