Rolex caliber 1555b

Rolex caliber 1555b
Brand:Rolex
Reference:1555b
Movement:Automatic
Display:Analog
Diameter:28.50
Jewels:26
Frequency:18000
Date:Date, Day
Hands:Hours, Minutes, Seconds
Additionals:Chronometer

Description

Third generation Rolex Day-Date movement, introduced around 1959/1960