Silk, of course. What a gift for an oil geolgist!
 
This 'find' of a tie was in my Dad's or Uncle's tie collection. It was so special because a neighbor bought oil stock and became a milionaire! Truly! The Schmitz Family on Elgin Avenue in Forest Park, Illinois, got rich! They lived next door to Uncle Harold. Until they moved away to their millionaire abode.
 
A family treasure because of the story, and because the guys played poker on Saturday nights.  All kinds of gambles are out there, and close. For a while after the Schmitz story, the men would take turns wearing that tie when they played poker.
 
Buy this for only $100.