|You can buy these here.|
Physical coins are fun.
Advanced Dungeons & Dragons, in its first edition, is famous for its heavy coins. Each has a weight of a full tenth of a pound, or 1.6 ounces for each coin! In the second edition, this was changed to 50 coins to the pound, which is better. Though still pretty heavy compared to average historical coinage, it is within the typical coin weight range.