I can't nail down the exact Day One, but I'm sure it was on the market by 1962. I'll try to dig out some old mags & get you something better.
Incidently, the plane debuted the "Super Bee", which was a Babe Bee with a TeeDee 2-port cylinder. That got everybody I knew (which was quite a few) to upgrade ALL existing Babe Bees and Golden Bees.