These watches are produced during the early 1970's as a countermeasure to the Seiko bullhead chronograph. The 8110s are also nicknamed Citizen bullhead. 8110 is equipped with a 23 jewels automatic with quick set day-date function. It is also a flyback chronograph with 2 subdials (30 minutes and 12 hours). With crown signed 'CTZ" and 2 push buttons on the 12 o'clock position of the watch. These chronographs are actually value for money comparing to Seiko bullhead and their Swiss counterparts like Omega and Tag Heuer of the same era.