This is the newer style white FW (and yes, it's sort of green . . .) I have an EV from 1964, but it's not right in the database as the number shows a different model.
I also have one that is an FA- and appears to be from 1969.
One case has two latches that lock, the other had only one that does not lock.
These machines were actually called "Featherweights" by Singer. Singer made a plastic FW too. I got all excited when someone was going to show me their white FW they got from their Mom, and then they pull out this cardboard box and open it up to show me a plastic FW.
Also - they are quite different than the older style black ones. Singer made a few older white ones too - I'd love to get a hold of one of those!