The Caliber 817 was a flagship manual-wind movement for Longines during this golden era, renowned for its slim profile and reliable Swiss engineering. Key Specifications: Condition: Excellent vintage condition; 100% all-original components. Provenance: Includes the original sales receipt , a highly desirable "full set" attribute that significantly enhances its collector value. Case Diameter: 22.5mm (excluding the crown); a classic, petite cocktail watch size. Movement: Longines Cal. 817 Manual Wind; a high-grade Swiss mechanical movement requiring daily winding. Case Material: Gold-Filled ; a thick layer of gold bonded to a base metal, offering a much richer and more durable finish than standard plating. Dial & Crystal: Features the original factory dial (untouched/non-refurbished) and a classic glass crystal Authenticity: Fully original, including the signed crown and internal movement parts. The inclusion of the original purchase document makes this particular Longines a true "time capsule" piece, documenting its journey from the showroom to the present day.