PITTSBURGH (AP) — The 500 millionth lighter produced by the family-owned Zippo Manufacturing Co. in northwestern Pennsylvania didn’t exactly roll off the assembly line Tuesday.

Rather, it was passed along, hand-to-hand, in two pieces — the lighter’s brushed chrome-plated brass case and its fuel-and-wick assembly innards — by each of the company’s 620 employees, who were lined up between the plant and the Zippo museum a few hundred yards away.