![]() Check case and movement serial numbers 1900. If the watch has a see-through case back, it will be engraved. Another list with dating by sale and case numbers (IWC official site) - list with production dates and pictures. It is the improved version of the «IWC Automatic» developed under the technical director Albert Pellaton. Tag Heuer watches without serial numbersAs mentioned, all Tag Heuer watches have serial numbers. This watch is driven by the automatic movement of caliber 8521 with a calendar module. The case is in top condition and has sharp edges (see pictures). Even the famous Dauphine hands are absolutely original and intact. The round hour markers have an authentic tritium lume, which was never repainted. This particular example is in an excellent and completely original condition. Among the early models of the reference 666, the variant with date display (reference 666 AD) is much rarer than the usual version (reference 666 A) without date. Here we offer the IWC Ingenieur 666 AD with date display from 1957. The serial number is located on the movement of each watch, either on the back or under the dial. The Schaffhausen watch manufactory stands for mechanical precision, reliability and elegant design. It was the first reference in the long line of the Ingenieur models and is today a sought-after and high-collectable watch. The IWC Ingenieur Reference 666 belongs to the category of the most important watches of the last century.
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