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The Reference 4099 is an early multi-scale chronograph produced by Rolex during the 1940s. It is typically powered by a Valjoux 23 manual-wind movement, a two-register caliber. The technical specification is a 35mm case, found in stainless steel, yellow gold, and two-tone combinations, with a non-Oyster snap-on case back. Its defining feature is a complex dial with multiple printed scales, most commonly a tachymeter on the outer edge and a telemeter scale within it. It is historically significant as a classic example of the mid-century “scientific” chronograph aesthetic.
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