disrespect in my comment. I was chatting with another collector about your offer myself telling him about your offer and I thought it was good. He had sold his set years ago and was thinking of getting another set. Which was after I had posted here. Anyhow he had mentioned to me that the Franklin Mint had made up the 36 piece sets. Then once the error was noticed they offered for anyone that wanted to they could return the error and the Mint would trade the corrected version for the error. Most people opted to keep the error and buy the single corrected version. Hence the 37 pieces. As I said earlier, I thought you price was a fair good price. The average of $36.11 for each sterling token plus 3 free tokens on each card.
I do not own the set on the card stock as you do. I always prefer to do my collecting the hard way. One at a time. So my set of "38" was all collected "one piece at a time". (Johnny Cash). Also I only collect sterling or .999 silver so when I do end up with nickel or brass tokens, I sell, trade or give them away.
And to follow up with a picture here is number 38. Sometimes refereed to a a Salesman Sample. You can call it what ever you like to. And yes, it to is made of sterling silver as mentioned on the card but not the token.