1973 Audemars Piguet Ultra Thin in yellow gold

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In the early 70s, Audemars Piguet was the undisputed master of the "extra-plat" movement. This yellow gold reference is an exercise in minimalism, focusing entirely on proportion and finish. The dial is clean, the case is razor-thin, and the movement inside is a mechanical marvel of micro-engineering. It is the definitive 1970s dress watch—slim, golden, and profoundly sophisticated.