BALL Watch Company Ball-Longines

The Ball-Longines is a manual-winding pocket watch caliber introduced in 1900 and produced under contract by Longines for the BALL Watch Company. It was designed to meet the stringent accuracy standards required for railroad timekeeping in the United States during the early 20th century. As a non-in-house movement sourced from Longines, it reflects the common practice among American watchmakers of the era to equip their railroad-grade watches with Swiss-made movements. The caliber has been discontinued and is considered a historic example of the Ball-Longines collaboration.