It uses a 987 F movement, considered one of the two best movements Hamilton made. This “Harris” model fits factory specifications of watches with 987 F movements.
The movement uses the Elinvar hairspring patented in 1931 and used in 987 F models. The name Elinvar was derived from the term “Elasticity Invariable” and was the first alloy to resist the changes in elasticity that occur with changes in temperature.
The “Harris” has subtle but intricate design features – some of which I’ve pointed out using arrows and text on photo. The most definitive design characteristics are from the Art Deco period – Europe (1925-1929) and the US (1925-1939). Art Deco characteristics include elegant, functional, and modern art exhibited in the Harris. This timepiece has independent shapes within the overall shape. The shoulder bars are like tubes, the face frame contrasts in three positions, straight lines at the top of the face make sharp angles and then curves. It just has intricate design features.
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