The Hamilton 54 watch movement, introduced in 1914, is a hunter calibre movement featuring a bimetallic screw balance with a riveted staff. Additionally, an optional monometallic screw balance with a press-fit staff is available. The movement is equipped with a Breguet hairspring, and in later samples, the setting-lever spring and click spring have been modified. Notably, the balance with a press-fit staff and with a riveted staff are completely interchangeable with regards to the hairspring. The J17 movement offers the following functions: stem wind and set, and sub-second indication.