This is the machine style I'm still missing for my "Boye Shuttle Collection". It was made by Eldredge before they became National - notice the base shape, and more importantly the picture showing the needle/slide plate configuration. So far this is the only machine I've seen with the needle plate shaped that way, square on the bed side and rounded on the slide plate side. It was sold under several names, not just Eldredge so it make searching for it a bit harder.
http://www.ebay.com/itm/400771986687...%3AMEBIDX%3AIT