Summit single stage
Thanks for the comments, it looks good for the price, like $120 for a gallon with all the reducers.
As for tip size I have no idea, its an old 25 year old NAPA gun made by Stewart and Warner. It will shoot enamel and base/clear with no issues, but you better be moving your hand fast with the clear, so my guess it is around a 1.5 tip.
This is a picture of base/clear, I shot with the same gun.