An 18 Karat Yellow Gold and $20 US Coin Concealed Wristwatch, Audemars Piguet, 36.00 mm case diameter, US $20 gold Liberty coin, dated 1889, hollowed out for outer case with hinged dial cover, concealed inner case, white dial signed AUDEMARS PIGUET, baton numerals, baton hands, hinged inner case swings out for setting, snap on case back, manual wind mechanical movement, black lizard strap, later 18 karat yellow gold deployant clasp signed TIFFANY GERMANY.Case back number: 91249.