Shaun:

you da' man today. First, showing us that beautiful Autavia GMT. Now, we say a big "Thanks" for acquiring this "Non-Calculatro" Calculator, and sending some fantastic photos of the watch. It's as rare as any Heuer we have seen, condition seems to be near mint, and Shaun has captured it with some excellent photographs.

Here's what I just posted on our "What's New" page of OnTheDash.

The "Calculator" was one of Heuer's distinctive creations. The Heuer Calculators offered the slide rule functions of the legendary Breitling Navitimer, but by moving the slide rule outside the crystal, Heuer greatly increased the legibility and usefulness of this instrument. Presented here is the rarest version of the Calculator. In fact, it's not a Calculator at all, but the Reference 11633 MHT, with Minute / Hour and Tachy bezels in the place of the slide rule. Heuer described this one as its "universal all-purpose chronograph"; we are delighted to see this sample and we thank Shaum Wainstein for capturing it and sending these wonderful photographs.