But how much are they worth? They use to be my dad's and he wore them on the dairy farm when he was 21. He's passed now and was 75 when he passed two years ago. I know the shirts were new when he bought them. I was born in 1957 and he got them during that time or before. Can someone help me price them? They are made of the Levi light blue denim and have the authentic LEVI'S tag on the left breast pocket, They also have brass buttons that say "Levi Strauss & Co. SF Cal" Can anyone help me with the price?