Citizen Watch US - So, 1973 called; it has the original Citizen Chronograph Challenge Timer—the brand's first full-fledged chronograph watch with the original bullhead design. #100YearsofCitizen #MyCitizen #CitizenWatch #TBT | Facebook,Citizen Challenge Timer Automatic Day Date 4cm Chronograph Rotating Dial Vintage,CITIZEN / CHALLENGE TIMER | UTDESIGN,Citizen Challenge Timer Vintage Chronograph Watch, Working, 38mm, 18mm Band | eBay,シチズン ツノクロノ チャレンジタイマー 1971年製 自動巻きクロノグラフ 純正ブレス – FIRE KIDS