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The Hamilton Watch Company is a brand of the Swatch Group, a Swiss watch company based in Bienne, Switzerland.
From 1969 to 1972, all new Hamilton watches were produced in Switzerland by Hamilton's Buren subsidiary.
In 1971, the Buren brand was returned to Swiss ownership and by 1972, the Buren-Hamilton partnership was dissolved and the factory liquidated, due to decreased interest and sales of the Hamilton-Buren product.
Ardmore, a collection part of Hamilton heritage since 1937, gets a modern style with trendy colors and matching roman numerals.
The small second function at 6 o'clock ads a touch of watchmaking history.
The Model 21 and 22 had a two-day power reserve and the movements of both were marked U. Micro Rotor/Micro-rotor) movement into small numbers of certain upper tier watches, in addition to their ordinary hand-wind and traditional automatic watches.
The Buren (now Hamilton/Buren) Micro-rotor was the first patented automatic wristwatch movement to eliminate the sizable external oscillating weight inherent to most automatic winding watches.
Keystone manufactured watches featuring a patented "Dust Proof" design that used a small acrylic "window" to cover the only opening in the plate of the movement.
Keystone existed until 1891 when the company was sold to Hamilton Watch Company.
Instead, it utilized a much smaller weight that was entirely integrated into the chassis of the movement.