I’m currently working on an article which will provide a reference on all the chronograph models using Citizen’s 8100 and 8110 movements. Although I say ‘all’, I’ve not been able to find a definitive list anywhere, so I’m putting it together myself. I hope it will be as comprehensive and definitive as possible, once I’ve reached a point where I’m happy I’ve sorted out the Challenge Timers, more usually known as ‘bullheads’, which are often seen these days with after market dials and hands.
So watch this space, I hope to publish the page within the next week or so. Once I do I’ll be very happy to hear from anyone who may have additional information on original models.