Who made 17 jewel watches?

17 jewel watches were produced by various watch manufacturers, but they are most commonly associated with companies like Seiko, Hamilton, and Bulova. The term "17 jewels" refers to the number of synthetic rubies used in the movement to reduce friction and enhance accuracy. This feature became popular in mid-20th century watches, signifying a level of quality and craftsmanship. Many brands produced 17 jewel watches as a standard for reliable timekeeping.