THE ESSENTIALS

MAKE: HEUER
MODEL: 150.633
YEAR: 1972
BOX/PAPERS: NO/NO
CASE DIAMETER: 45mm
CASE MATERIAL: STAINLESS STEEL
BRACELET MATERIAL: STAINLESS STEEL
MOVEMENT: AUTOMATIC

 Allow us to introduce you to the Heuer Calculator - a Reference 150.633 from the 1970s. This is not merely a timepiece, it's a mathematical tool. This innovative wristwatch is a testament to Heuer's ingenious approach to integrating function and design. The Heuer Calculator is as intriguing in its mechanical prowess as it is remarkable in its aesthetic appeal.

Heuer has always been known for its contributions to the world of sport timing, specifically in auto racing. However, the Calculator, conceived in the 1970s, stands out as a divergence from the norm. Rather than a racing chronograph, the Calculator is a blend of a slide-rule timepiece and a diving watch. This interesting marriage of functionality underscores Heuer's inventive spirit.

Equipped with a bi-directional rotating bezel, this watch allows you to perform various mathematical calculations, such as multiplication, division, and conversion of units - a remarkable feat for a mechanical wristwatch. The watch houses a reliable automatic Buren caliber 15, renowned for its precision and durability.

At 45mm in diameter, the watch's stainless steel case is certainly sizeable, yet it wears comfortably on the wrist due to its cushion-shaped case and integrated bracelet. The dial is an uncluttered blue, allowing the orange hands to pop for maximum legibility. 

But the real star of this timepiece is undoubtedly its bezel. The outer ring houses a logarithmic scale, which, in conjunction with the inner slide rule on the dial, can be used for calculations. This offers an engaging interaction for the wearer, merging the cerebral joys of mathematics with the tactile pleasure of mechanical horology.

In short, the Heuer Calculator is a testament to a time when Heuer dared to experiment, stepping outside its usual domain to craft a timepiece that straddled the worlds of mathematical calculation and mechanical watchmaking. This watch is a prime example of the exciting innovations that emerged from the vibrant watchmaking scene of the 1970s.