Yes, finding info about Tissot is almost impossible. My focus is on late sixties early seventies chronos and divers, and they seem to have used every caliber available with an endless stream of slightly different dials.
Add to that the fact that the only book written on Tissot is actually a history of the company, but not of the watches themselves, and the thing turns into an everything goes affair.
I am sorry I cannot be of any help; whenever I see those Tissot chronos, I force myself to look the other way. I just want a Swedish military and a T12 and I will be done with Tissot chronos.
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