Model 9..
This was the first Sunbeam with a beater ejector I believe, Im pretty sure it was made from 48 to 50 when the 10 was introduced, it was built thru 55 then the 11was made until 57 when the 12 came out, it was made until 67, 10 full years...before the 9 was the 7, their was no 8...also the 9 was the first to have the button on the beater to control bowl speed.I may be off on some of this, but I think its correct.