I have received my dad's Simplex and am wondering if their is a way to determine what year the bike was made.  Unfortunately, I can not ask my dad because he passed away in October of this year.  He had actually told me that I could have the bike to restore 3 days before he passed.  What I do know is that my dad bought the bike brand new in Grand Rapids, Michigan.  It is a direct drive and the gas cap is on the left side of the tank.  I will try to get pictures taken and put on here tonight.  Thank you.

Paul