This is an B. Eldredge Automatic - made by National.
It's a copy of the Wilcox and Gibbs machine, so now I have a pair of them.
I have two more machines in transit - so I'll share those when they arrive (still no White 670 though).
I also bought some attachments I'm very excited to be getting - not for the attachments but something else that looked like it was tucked in with them. Won't know for sure until it arrives, and I only paid $15 including shipping, so figured it was worth the chance. Now the hard part - waiting for it to show up!