That should clean up nicely. It looks like it is one of the earlier ones.
A couple of good pages that talk about the 301 are
http://singer301.com/about/default.html and
http://singer301.com/dating/default.html
It that was mentioned on the first link that "It's the only combination portable and cabinet model on the market." It also tells of the different styles including the decals on the black machines and describes the other colors as well. The long bed 301 aka 301-2 was the one in the carrying case.
While there is a disclaimer at the top of the page of the second link about it not being completely accurate it is probably a lot closer than 6 years.
Janey - Neat people never make the exciting discoveries I do.