Movement
Calibre 501
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Lignes
11.5
Mounting Diameter
25.6
Thickness
6
Frequency (vph)
19,800, 21,600
Jewels
21
Power Reserve
44
Hand Sizes
1.50, 0.90, 0.22mm
Complication
Date
Power
Automatic
Shape
Round
Size
Medium
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Notes
The Longines 501 family is based on the Record 1955 family of movements. Longines acquired Record in 1961. At this time as Longines was coming under increased pressure from the emergence of electronic movements along with other upheavals in the watch industry it looked to find existing calibres made by other companies that could be produced more inexpensively than its in-house calibres and help it maintain profitability.
19800 A/h:
501: date
503: day, date
505: quickset date
507: day, quickset date
21600 A/h, micrometer regulator:
506: quickset date
508: day, quickset date