Hi i'm from the up mich. I have a chance to buy some die stamps from the marble knife co from the 30-40s I haven't seen them yet .I just want to get an idea on how much they would be worth or how much should I offer? I have a marble collection and I know the prices of knives . but I have never seen dies for sale . he also has some knife blanks .How much should i offer for these? Thanks allot Gary d