The Heuer caliber 107 is a digital quartz movement with 0 jewels. This caliber was used in Heuer Senator GMT watches produced between 1979 – 1982.
Setting the Time
To set the time on the caliber 107, there is a pusher located on the side of the case.
While it is possible that the chip used in the caliber 107 was sourced in the United States (Integrated Display Systems aka IDS), the chip was most likely produced by Heuer Micro-Technik in Switzerland, a division that was launched in 1977.
This movement is no longer being produced. As a result, many Heuer Senator GMT watches are being sold with the analog dial working but the LCD dial non-functioning. If you find one with a working digital movement, definitely consider acquiring it.