I don't know the total silver content of the $20 strike you pictured but I do know that the Players & Star Casino strikes from Lake Charles Louisiana are extremely hard to find and were only in play a few months. I live a couple of hours from the location of that casino and I never was able to get the entire set and I only have one of their twenty dollar strikes in my collection. The casino was bought by Harrah's and they changed everything, then it was destroyed by a hurricane never to be opened again. Players was one of my favorite casinos to visit. I sure have some fun memories of the place.

PS: The twenties came from the dollar strike machine and it was very tight.