Jack's watch was given to Jack by his father Christian Shephard on the day he married Sarah. The gift had originally been given to Christian on his own wedding day by his father, Ray Shephard. Christian explained that he had never worn it himself, because on that day Jack's grandfather had told him of his disapproval of Jack's mother Margo. After Christian explained that he thought that Jack - unlike himself - made the right choice, Jack immediately put the watch on his wrist. ("The Watch")
- The watch Christian gave Jack was a two tone Rolex Datejust on a Jubilee bracelet. If the watch was made with an older Rolex 1570 movement, it would be model 1601. If the watch has the 3035 movement, it would be a model 16013, made in the late 1970s and 1980s. Assuming that Jack was born around 1970, and after the marriage of Christian and Margot, it must be the former.
- Jack gave Hurley what may have been the same watch to keep an eye on Claire's contractions shortly after the crash of Flight 815. ("Pilot, Part 1")
- In the Season 1 Deleted Scene "Claire's Doctor Visit", Jack took Claire's pulse using what may have been the same watch.
- Jack removed the watch to go through airport security in John Locke's vision in the sweat lodge. ("Further Instructions")