Missing Pieces (1): The Watch - S0.E17

Lost: Missing Pieces are 13 two- to three-minute stories of compelling, new, never-before-seen moments from the hit television show LOST. These newly-created scenes (not deleted scenes from previous episodes) reveal answers and new details about your favorite characters. For each story, we leave it up to the fans to figure out where these pieces fit into the overall mythology.

Christian is talking with Jack about his wedding, which is later that day. Christian reveals that his father disapproved of him marrying Margo, and that was the reason he didn't wear the watch given to him by his father on his wedding day. However, he tells Jack that he is doing the right thing marrying Sarah and passes the watch to Jack, who immediately puts it on.