Good job Jeff, Bruce, Chuck et all.

I'd also like to congratulate you Jeff, for your careful wording.

In my opinion there are many gray areas in Heuers (and vintage watches in general) so we better be careful, because none (not even Hans, not even Jack Heuer himself) knows every detail about all the watches (and their variations) ever produced by Heuer.

All these gray areas are also one the reasons I'm generally against value estimates. Look for example the carrera-monza situation. It is true that the production cost, the initial selling price and now the vintage market price is higher for the carrera. But I wont be surprised at all if I saw a monza sell much higher than a carrera. Here are some of the possible explanations.
- Market fluctuates. (We have seen 2 identical models sell for completely different prices many times, now imagine the price fluctuation for 2 different models!)
- The value of a watch in the vintage market is defined by unknown factors. How can we explain the price difference between Monacos and other Heuers? Are all these people buying Monacos at a premium because of the Steve Mcqeen connection? I don't think so. After all we know that he was not a great Heuer fan and was mostly a Rolex-man. Monacos are selling higher and that's it. I wont try to explain it. I call it the "I want this watch" factor.
- Maybe black anodized cased come back in fashion in a strong way and you'll se Monzas selling at a premium.
- Maybe the specific Monza (without the Monza on the face) is considered extra-rare.
- Maybe there are more cal.12 Carreras than cal.12 Monzas, so the Monzas are harder to obtain.
etc.
etc.

My point is everything is relative and temporary. Everything "is so until..."
No matter how broad or deep is our knowledge of the technical aspects, the model variations or the history, it is still limited.
We don't know everything and we can't foresee anything.

Keep up the good work.