1960s IWC Ingenieur 666 with unique numeral dial

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The Ingenieur 666 is the bedrock of IWC’s anti-magnetic heritage, but this specific example defies the line’s usual austerity with a rare numeral dial. While most 666s feature simple batons, the Arabic numerals here add a layer of mid-century character to an otherwise "over-engineered" tool watch. Powered by the legendary Pellaton-winding Calibre 853, it offers the perfect marriage of Swiss engineering and a design that isn't afraid to stand out from the pack.