Longines Rare Vintage 13ZN Chronograph SS (23996)

23996 Longines Vintage 13ZN Chronograph, very rare steel case on a leather strap, clean original silver dial, blued hands, acrylic crystal, solid caseback, clean case with sharp lugs, circa 1940, diameter: 34.5mm, thickness: 12.5mm, Rare and Unique Watch in Excellent Condition and just serviced and comes with European Watch Company Pouch and 6 month warranty.

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More about Longines Rare Vintage 13ZN Chronograph SS

This is a vintage 1940 steel Longines Chronograph with the venerable 13ZN caliber. It has a leather strap with a stainless steel tang buckle, and an acrylic crystal. It has a solid snap-on case back, and a single rectangular chronograph pushbutton at the 2 o'clock position on the case. The 34.5mm diameter three-body case, and downturned lugs are polished/brushed. The dial is silver with painted black radial Arabic hour markers and outer tachymeter track. It has blued epee hands and a center sweep chronograph hand. There is an outer minute/second track with 1/5-second divisions and Arabic numerals every five minutes. There is a constant seconds subsidiary dial at the 9 o'clock position, and a 30-minute chronograph register at 3 o'clock. The 12.5mm thick case, dial, and movement are all signed.

This mechanical manual winding Longines caliber 13ZN movement is frosted gilt. It was constructed with 17 jewels, a straight-line lever escapement, and a bi-metallic balance. It includes a self-compensating Breguet balance spring, and index regulator. The mechanism oscillates at a frequency of 18,000 vph.