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It appears to be one of the few that was NOT made by Heuer for Zodiac. :ak47;
<VERY tongue in cheek>
:ar15; That's because Tag made it before Heuer existed :godfather;
:lolz;
Some worker at the Heuer factory must have snuck those parts out and assembled it at home or something because we all know that the Heuer company is responsible for the construction of any quality chronograph made since 1860. Without them, the swiss watch industry would not have survived........we would not have watches at all.........time would not exist.......and the earth would not continue to turn.......
......atleast that is what the extremely knowledgeable watch experts on the internet would have us believe ;)