I could not find anything in my research about this org., perhaps you know and that's why you're here. 

Yes, grandpa was a big hat/cap collector with thousands procured over his career as a crop inspector.

Maybe the club has disbanded? It's been a fun learning experience. He'd be tickled knowing his collection has been (ongoing) distributed around the world.

Anyway, here are the years in the lot.

1982/3

1988

1989

1990

1992

1993

1994

1996

1997

1998

1999

2000

2001

2002

Better to check the pics though.

All shipped in a sturdy box.