Rolex Oyster Speedking 6421

The Rolex Oyster Speedking ref. 6421 is a compact, manually-wound wristwatch from the 1950s and 1960s, designed with the same durability and water resistance expected of the Oyster line, but in a smaller case format. The stainless steel case measures 30.5mm in diameter with a smooth bezel, acrylic crystal, and screw-down crown and caseback, emphasizing Rolex’s tool-watch ethos. The watch is powered by the Rolex Caliber 1210, a reliable manual-wind movement that was a mainstay in Rolex’s hand-wound models of the era. Dial variants included silver, black, or white tones, with simple applied markers or Arabic numerals and pencil hands, maintaining a clean and legible appearance. Its lug-to-lug length is approximately 36mm, with a lug width of 17mm, giving it a modest and refined profile suitable for smaller wrists or those seeking a subtle vintage aesthetic. While not as widely collected as larger references, the Speedking 6421 remains a solid entry point into vintage Rolex, prized for its simplicity and heritage.