## Longines Master Collection Annual Calendar Automatic **Ref. L2.910.4.51.7 – Full Set – Black Dial – Excellent Condition** The Longines Master Collection represents the brand's commitment to traditional Swiss watchmaking, combining timeless elegance with sophisticated mechanical craftsmanship. This Annual Calendar model is one of the most refined references in the collection, offering both everyday practicality and classical design. Powered by the Longines Caliber L897 automatic movement, the watch provides an impressive power reserve of approximately 64 hours. The Annual Calendar complication automatically adjusts the date for months with 30 or 31 days, requiring manual correction only once a year at the end of February. This practical complication is rarely found in this price segment and is highly appreciated by collectors. The glossy black dial creates a refined and versatile appearance, perfectly complemented by polished stainless steel and elegant applied indexes. Through the sapphire exhibition case back, the beautifully finished automatic movement can be admired. This example is offered as a **complete full set**, including the original Longines presentation box, international warranty card dated **September 2024**, instruction manuals and accompanying documents. The watch remains in **excellent pre-owned condition**, showing only very light signs of careful use. The sapphire crystal is free from scratches, while the dial and hands remain clean without discoloration or corrosion. The original Longines leather strap and original deployant clasp are both included and remain in very good condition. The watch is currently running at approximately **+10 seconds per day** when measured on a timegrapher. ### Specifications * Brand: Longines * Collection: Master Collection * Reference: L2.910.4.51.7 * Movement: Automatic (Caliber L897) * Power Reserve: Approx. 64 hours * Case Material: Stainless Steel * Case Diameter: 40 mm * Dial: Black * Crystal: Sapphire Crystal * Case Back: Sapphire Exhibition Case Back * Functions: Hours, Minutes, Seconds, Annual Calendar, Day, Date * Water Resistance: 30 m ### Included * Original Longines box * International warranty card (dated September 2024) * Instruction manuals * Complete original accessories A sophisticated Swiss timepiece combining elegant design, practical complications and outstanding value. An excellent opportunity to acquire a modern Longines Master Collection Annual Calendar in beautiful condition with a complete set.