The Citizen Chronograph Challenge Timer is the more conventional layout to the Bullhead watch, and uses the same movement.  Model reference 4-900031TA


From the serial number on the case back we can accurately date this watch to being in December 1972.


This model was named by as ‘one of the most beautiful Citizen ever made’ on their dedicated page to this model, which is good reading.  The 23 jewel movement, calibre 8100A, is very high specification.  The column wheel chronograph, high beat escapement (28.8kbph) and flyback function on the chrono to allow you to stop and restart the timer instantly would all normally be associated with a more expensive watch.  This watch was from the first year of production for this calibre, which is only three years since the launch of the very first automatic chronographs ever available.  To add to this Citizen also included a day and date calendar, both with the ability to be quickset, and the day wheel can show either English or French on this example.  The dial is good, with some marks to the silver tachymetre  The 30 minute chronograph subdial is set off with green and orange highlights very effectively.  The case has a black finish, which isn’t bad but not perfect, and that description would also be good for the glass.  The black finished bracelet is new but not by Citizen.

This watch will be supplied with our branded presentation box and our Certificate of Authenticity.

Please see the HD video for more detail.  All photos and videos are part of the description and are of the actual watch unless mentioned.  We do not photoshop any pictures, and the images are copyright of and should not be used without permission.


Width with crown  39.3 mm

Width without crown  37.5 mm

Between lugs  18 mm

Lug to lug length  45.0 mm

Case Thickness  12.8 mm

Bracelet will fit a maximum wrist size of 219 mm.  The bracelet can be sized for you if you give us your wrist size when placing the order.

All sizes are approximate.

Included with this watch is a 3 month guarantee and free delivery to UK addresses.  If you live outside the UK we can still deliver to most countries.  Please see our Worldwide Shipping information, or Contact Us.   Payment can be made by most credit or debit cards, bank transfer or PayPal.

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