We have a winner!
12 it is, and for picking the corect number Stump is going to send you one of those mini macs with "572XP" written on it with a magic marker and a coat of silver paint on the clutch cover.
A year seems like a long spread here in the internet age where we can see what's going on in other places in the world. But it's kind of typical of how things have always been done. Years ago you might hear some whispers but you wouldn't know about a new saw until you saw one sitting on a dealer's shelf.
On the bright side.........if there's any service bulletins or updates, it's somebody elses turn to sort them out.