Longines Single-Pusher Chronograph

About this reference

The Longines Single-Pusher Chronograph featuring the 13.33Z caliber was produced primarily between 1913 and the early 1930s. Collectors prioritize this reference as it houses the first purpose-built chronograph movement designed for a wristwatch, predating the 13ZN. The silver-cased variants often feature 35mm to 37mm dimensions with hinged "officer" casebacks and fixed wire lugs. Dial configurations typically include white enamel with red or black pulsations scales and Breguet numerals. Due to the movement's historical significance and the fragility of enamel dials, well-preserved examples are rare. On the secondary market, these watches generally command between $15,000 and $35,000 depending on case material and dial condition. A notable 1913 silver example sold at a Phillips auction for approximately $32,500, illustrating the premium placed on early production pieces with original components and intact enamel. This reference represents the transition from pocket watch conversions to dedicated wrist-worn chronographs.