Amazon has the Trademark Gambler's Wall Clock Diversion Safe for $12 with free shipping for Prime members. Outside dimensions are 10 inches by 10 inches by 3 inches thick, the inside dimensions of the safe are 8 1/2 inches x 8 1/2 inches x 1 7/8 inches.
eBay has the Casio Men's G-Shock Solar Multi-Band Watch (GWF1000-1) for
$350 with free shipping. Features stainless steel casing, solar quartz movement, tide & moon data, and water resistance to 656 feet.