Movement
Calibre 420
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Lignes
10.5
Mounting Diameter
23.3
Thickness
2.5
Frequency (vph)
21,600
Jewels
17
Complication
Subsidiary Seconds
Power
Manual
Shape
Round
Size
Medium
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Technical Diagram
Notes
The 420 was the first new calibre produced by the brand since the 340 family and 370 in 1960. Like the 370 it had a subsidiary seconds and was also produced in an orientation without running seconds called the 428. Later the movement would be renamed the L846/L847.
420, L846: Subsidiary Second
428, L847: No Running Seconds
.3 Suffix: European Market
.4 Suffix: American Market