Heuer Calculator Chronograph Wristwatch

Inventory number: WW2302002

Made circa 1975, 45mm, stainless steel, housed with self-winding movement Cal.12, 17 jewels. REF. 110.633N. A black-color dial, 30-minute counter on 3 o’clock, 12-hour counter on 9 o’clock, date aperture on 6 o’clock. Two-layer slide rule on the bezel. The outer ring rotates and the inner ring remains fixed.

In 1972, Heuer introduced a new model that was both technical and futuristic, named "Calculator," which had a name evoking mathematics. Each Calculator came with a manual that provided detailed explanations of all possible arithmetic operations. The Calculator featured a slide rule as its bezel, making it a sophisticated system capable of solving complex arithmetic problems. The production of this model continued until 1982.

Functions: hours, minutes, dates, chronograph and calculator.

The Calculator's slide rule consists of two primary scales - the C scale and the D scale. These logarithmic scales are identical and span from 1 to 10, commonly used for multiplication and division operations.

In addition to the standard slide rule scales, the Calculator features a wide range of unit conversion marks on the inner bezel. These marks are designed for converting various types of units, including:

nautical miles / statutory miles / kilometers / yards / feet / inches

knots / miles per hour / kilometers per hour / miles per minute

imperial gallons / U.S. gallons

pounds / kilograms

Brand History

The watch manufacturer Heuer is founded in the year 1860 by Edouard Heuer in Saint-Imier. The company underwent several name changes before becoming TAG Heuer in 1985. TAG Heuer has built on its active involvement in sport to create some of the most accurate watches and timing instruments in the world. It is now the leader in luxury chronographs of unrivalled precision, measuring time to 1/10th, 1/100th, even 1/1000th of a second.