Vintage Charvos Drafting Set 1940s USA 10 Piece AS IS Read

Vintage Charvos Drafting Set 1940s USA 10 Piece AS IS Read... These were my dad's in college in the 40's. He was going to be an architect. But his dad died and he had to take over the family shoe store. I don't think he even used them. They are rusty, musty smelling and the case doesn't close.