Secret neck watch in yellow gold (750) concealed in a 20-dollar gold coin from 1899.
Lid opening by pressing a button concealed in the edge.
Round case in yellow gold (750) tilting.
Dial with gold bottom, signed, black-painted stick indexes for the hours.
Hand-wound mechanical movement.
Clip-on back.
Gross weight: 34.7 g. - Diameter: 33 mm.
Small scratches for use. 00/
Piaget launched the secret coin watch in 1957, whose case was made from a 20-dollar gold coin, partly hollowed out to enclose a thin gold case.
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