Early Elgin Convertible Watches (1870s–1880s)

 Early Elgin Convertible Watches (1870s–1880s)

In the 1870s and 1880s, the Elgin National Watch Company produced 

specialized pocket watch movements known as "convertible" movements. This design innovation allowed a single movement to be fitted into either a hunter-style (closed face) or open-face watch case, offering flexibility for both jewelers and customers. 

Notable early convertible movements

Introduced in 1878, Elgin's first interchangeable, stem-wind, three-quarter plate movements were a novelty of the time. Early convertible movements from this period include: 

• Grade 86 (c. 1884)
  : This 16-size, 15-jewel movement was one of the popular models for conversion. It featured a three-finger bridge design and a unique lever-set mechanism for changing the time.
• Grade 93 (c. 1883)
  : This was an 11-jewel, gilt-finished movement in a 16-size. Its distinctive lever-setting device was deeper than other movements of the era, requiring cases made specifically for it. The setting mechanism featured a wheel that lifted to engage the hands.
• Rarity of complete watches: Since these movements were deeper, they often required special cases. While the movements themselves are not uncommon, a complete, original convertible watch in its designated case is a rare find today.