The antique Chinese coin is of flattened and rounded form with square hole in the center, cast with four characters Da Tong Guan Bao on the surface, used during Song Dynasty period.|||Diameter: 2 7/8 in (7.3 cm) Weight: 74.0g|大觀通寶折五十|大觀通寶是北宋徽宗趙佶在大觀年間所鑄造的年號錢這枚"大"字一捺特別長的當十大觀通寶，製作精緻美觀，地章平整，面文和緣深峻。宋代錢幣在史上佔有重要地位，是今天人們觀賞、收藏的豐富寶藏。