Containing of gold and measuring (octagonal) and across (round), the $50 pieces are the largest and heaviest U.S. coins ever issued; the octagonal one is the only U.S. coin not to be round.
The $50 pieces were containing of gold and measuring (octagonal) and across (round). The $50 pieces are the largest and heaviest U.S. coins ever issued. The octagonal one is the only U.S. coin not to be round.