Sunbeam Vista
Your pictured mixer was made near the end of model production. The stand had two position bowl adjustment by moving the turntable. The earlier models had a bowl adjustment in the front of the stand. I am not certain if any of these white models had a metal stand. The first Montgomery Ward clones of this model had a metal stand. The juicer bowl I have for this mixer vibrates during use. This is my favorite Mixmaster model. Great combination of powerful motor, bowl-fit beaters, ease in cleaning, and price at the time it was new.