Vintage Hamilton automatic micro rotor movement, complete and fitted with the desirable Calibre 666. A complete Hamilton Cal. 666 automatic movement featuring the company’s well-known micro rotor construction. Hamilton’s micro rotor calibres are appreciated by collectors for their compact and innovative design and represent an important period in the development of automatic wristwatch movements during the mid-twentieth century. The movement is currently running; however, it has not been tested for timekeeping accuracy and should be regarded as requiring service before regular use. Technical Details • Hamilton automatic movement • Hamilton Calibre 666 • Micro rotor design • Complete movement • Diameter: approximately 28.5 mm • Running condition • Accuracy not tested • Service recommended Condition Pre-owned vintage condition. The movement is running at the time of listing but has not been tested for accuracy, power reserve or long-term reliability. The movement appears dirty from age and storage and shows signs of use consistent with a vintage watch component. A full service is recommended before installation or regular use. Please study all photographs carefully as they form an important part of the description and condition report. Collector’s Note The Hamilton Calibre 666 is one of the company’s best-known automatic movements and forms part of the celebrated micro rotor family introduced during the 1950s and 1960s. Micro rotor movements achieved automatic winding through a recessed oscillating weight integrated into the movement rather than a full-sized central rotor, allowing for a thinner and technically sophisticated design. These calibres remain popular among collectors and restorers of vintage Hamilton watches.