were divided by lasers and gps guided, measuring time was critical. i ve read that if your watch was off by more than about four seconds, then you could be off as much as about one nautical mile in terms of launch. jon: so during world war ii, the u.s. government commissioned the building of these accurate pocket watches and issued them to military perts knell. it was flown personnel. it was flown on all the b-17s, b-24s in europe during world world war ii, and s built for the navigators on this aircraft. jon: just one problem. if you re going to take apart and refurbish all of these highly technical time pieces, who do you get to do the work? r.t. found the answer here in a converted garage. it starts with a challenge. you have a watchmaker tell me i can t do it, and that was enough for me to decide to do it.