It looks like you are right.I double checked the serial # it starts ED not DE like I thought.
I do not know anything about runabouts but it looks like the rear fender and sprocket are different.
Does it use the sturmy archer thumb shift like the other models? Any other differences?
Any information would be helpful.
Not sure about my plans with the bike yet.I would like to keep it at least for awhile.
If I do sell I will let you know.