Rolex caliber 1055b

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Brand:Rolex
Reference:1055b
Base: Rolex 1055
Movement:Automatic
Display:Analog
Diameter:28.50
Jewels:25
Frequency:18000
Date:Date, Day
Hands:Hours, Minutes, Seconds
Additionals:Chronometer
Rolex caliber 1055b

1055b description

Second generation Rolex Day-Date movement; altered 1055. 7.1mm high instead of 7mm. Introduced around 1957

All watches using the Rolex 1055b movement:

Rolex Day-Date 6611 (6611)

6611 Rolex Day-Date 6611
Rolex Day-Date 6612B (6612B)

6612B Rolex Day-Date 6612B