My 230 SL was produced at the end of September, 1966, and it has the Automatic badge below the 230 SL badge. It's a Euro version.
I believe I've been told that in the European market (car culture) an Automatic was a true luxury. Few people in the 1950's and 1960's spent the money for them regardless of car brand or model. I would bet the badge showed up on most Euro Automatics and not on many USA Automatics. I can't speak for other global markets.
Rodd
Powell, Ohio, USA
1966 230SL, Euro, Auto, Leather, both tops
1994 E420