Rolex 300

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Rolex 300 is a manual winding form movement by Rolex.

Features: 18,000 A/h, 15 jewels, small seconds, power reserve 50 hours.

Identical: Gruen 877 (Alpina Gruen Guild).

Built by Aegler and used in the "Doctor's Watch", Rolex used the Calibre 877 with slight modifications for the model Prince from 1932. The Prince was the first wristwatch produced in large numbers that received a chronometer certificate.


Aegler (Rolex)


Manual winding movement
Escapement: Stone lever
Yoke winding system
Bimetallic screwed balance
Breguet hairspring
Patented crown mechanism


Small seconds


7½ x 14½ lignes
D 16.9 x 32.71 mm, H 4.1 mm
15 jewels
18,000 A/h
Power reserve 50h

Production period: