Celebrate your Texan Pride by showing off this cool Texas Challenge Coin showing the Great State of Texas overlaid with the Lone Star flag on the front and the back of the coin shows the six different flags that have flown over the state of Texas. Texas State Seal Challenge Coin. 1.75", approximately 1.5 ounces, Gold-plated brass. This coin is part of a 3-coin set, all celebrating the Great State of Texas! Check out the other two coins!