Up for sale is the 1974 Citizen “Bullhead” Challenge Timer Chronograph 4-901011-K Cal.8110 in excellent condition. Images: https://drive.google.com/drive/folders/1F_7Uul-RBLSiLQJ0KKK7ObyQys4ss6F2 Video: https://drive.google.com/file/d/17A6fgkgS1qgENpg0nvNU9ZvCHoQaOoA2/view?usp=drivesdk Timestamp: https://drive.google.com/file/d/1mmMJZdagZSdKaCYWu9auVT3CdAtGeWpK/view?usp=drivesdk The Citizen Challenge Timer “Bullhead” Ref. 4-901171K stands as one of the boldest expressions of 1970s Japanese chronograph engineering—a decade when Citizen was determined to prove it could innovate not just alongside Seiko, but in direct competition with the major Swiss houses. Born from that fiercely creative era, the 8110-powered Bullhead showcases everything that made Citizen a serious force in mechanical chronographs. Its distinctive case architecture is instantly recognizable: the crown and pushers positioned at the top, giving the watch a purposeful, motorsport-inspired stance. The lines are crisp and intentional, the proportions compact yet assertive at 38mm, creating a silhouette that catches the light with a clean, almost aerodynamic clarity. The matte black radial-finished dial adds depth and refinement, with its dual-register layout balancing sportiness and precision in a way that feels unmistakably 1970s yet timelessly modern. Inside beats the celebrated Caliber 8110A—a true hi-beat, column-wheel flyback chronograph running at 28,800 vph. This movement was Citizen’s technical statement piece during the era, offering instant reset-on-the-fly functionality, independently adjustable day and date, and a level of mechanical sophistication that placed it firmly among Japan’s most impressive chronograph calibers. It was engineered with the same philosophy that drove Citizen’s most respected designs: reliability, innovation, and endurance. The watch is in excellent condition with minimal sign of wears. The stainless steel case remains sharp and untouched save for faint marks from long-term storage. The dial, hands, indices, and vivid green lume remain flawlessly intact, the acrylic crystal clear, and the caseback engraving still crisp. The crystal is clear and clean, dial is flawless. It comes on the original OEM bracelet that fits up to 20cm (8 inches). The movement has recently been serviced and is keeping excellent time at +/-5s a day. It comes with standard watchbox, no papers Price: $1200 + $60 flat shipping (via DHL/UPS express with tariffs/duty fee covered). Payment via PayPal F&F or G&S (+4.6% fee paid by the buyer). Not accepting trades. Feel free to message me with any questions or if you’re interested. Have a great day! Check out my other watches on Instagram: @jasonswatchcorner