This pocket-watch movement by IWC Schaffhausen, dated 1918 and identified as Cal. 66, speaks to early 20th-century watchmaking precision. The movement’s construction reflects the engineering priorities of the era: robust mechanics and straightforward serviceability, intended for long-term use. As a pocket movement, it exemplifies the transitional period before wristwatches became dominant, showcasing traditional finishing and layout. For a contemporary collector or maker, such a movement offers historical authenticity for study, restoration, or thoughtful conversion projects, connecting modern practice with a reputable manufacturer’s century-old technical heritage.