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Rolex A260
Last updated: July 26, 2025

Brand
Caliber Number
A260 (also Cal. 720/730)
Production Period
1945 – 1953
Lignes
10 ½”’
Diameter
23.7 mm
Height
Thick (necessitated “Bubbleback” case)
Power Reserve
Unconfirmed
Frequency
18,000 bph (2.5 Hz)
Jewels
17 or 18
Escapement
Swiss Lever Escapement
Anti-Shock Device
Variable / Optional for the era
Hand Count
3 (Hours, Minutes, Sweep Seconds)
Manufacture Region
Unconfirmed
Functions
Automatic Winding, Sweep Seconds
Rolex A260 Description
The Rolex A260 is a foundational automatic movement from the 1940s and early 1950s, often considered the base caliber of the “Bubbleback” family that includes the A295 and A296. As a non-chronometer, time-only movement, it served as the reliable engine for a wide range of Rolex’s Oyster Perpetual watches. Its design necessitated the characteristic domed “Bubbleback” case to house the self-winding rotor, making it a cornerstone of Rolex’s establishment of the modern automatic watch.
Watches Using The Rolex A260 Caliber
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