Im sure there is a simple answer, and I will feel stupid for asking. Im not talking about the S for mintmark
Thanks for asking. I was just wondering that about PCGS slabs and certain older label Morgans with S$1's. I assumed it was silver and didn't ask. Now I know for sure.
Ike Dollars come in both clad and silver. The older PCGS labels have the 'S$1' and the word 'Silver' on them and the clads dollars just have '$1' and the word 'Clad'. It looks like in Jan 2006 with the generations PCGS 15 holder the 'S' for silver was dropped. As it looks like this was a double referance for silver.