Rare 1970s Citizen bullhead Flyback in good original condition. Good original dial n chronograph plus flybaxk works good . Non polish case . 67-9356 Case Number: 4-901223 (Challenge Timer) . Cal 8110A. Promethium lume dials , as not simply signed ‘JAPAN’, but are signed ‘P-JAPAN-P. ( correct w 901280KA). One of the Japanese Masterpiece.
https://sweep-hand.org/want-an-original-citizen-bullhead-a-quick-buying-guide/
https://sweep-hand.org/citizens-vintage-chronographs/