Rolex Chronograph 4313

Reference 4313 is an early Rolex chronograph from the 1940s. Its technical specification is a two-register chronograph layout, typically powered by the Valjoux 23 manual-wind movement. It is distinguished by its smaller case size, usually around 33-34mm, and its non-Oyster, snap-on case back, resulting in a slimmer, more formal profile. The case is often found in 18k gold. The significance of the 4313 is its representation of the classic, elegant mid-century dress chronograph, before the shift towards larger, more robust Oyster-cased tool watches that would later define the Rolex brand.