====== Rolex 300 ======
**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 [[Rolex Prince|Prince]] from [[1932]]. The Prince was the first wristwatch produced in large numbers that received a [[chronometer certificate]].


<WRAP ud ud_mov>

**Manufacturer:**
  * Aegler ([[Rolex]])

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

**Functions:**
  * [[Small seconds]]

**Data:**
  * 7½ x 14½ [[ligne]]s
  * D 16.9 x 32.71 mm, H 4.1 mm
  * 15 [[jewels]]
  * 18,000 A/h
  * Power reserve 50h

**Production period:**
  * [[1928]]-[[1937]]
</WRAP>

{{tag>Movements Manual_winding_movements Rolex_calibres}}