So it begins:

68 Sedan said
Did I miss it? No one wanted to ask...."What's a 37 Henway?" (yeah, I know the answer)

I think that gas cap is for a Studebaker. They used a stylized "S" very similar to that.

Nope I didn't want to sound stupid and ask so I thought I'd do the smart thing and look it up

apparently I have lived a VERY sheltered life....although I must have heard that one somewhere b4 I still went on the snipe hunt... doh