One way to determine the identity of un-marked late 19th century American lathes is to get the book
American Lathe Builders, 1810-1910, Paperback by Cope, Kenneth L.
You can turn the pages and look at the hundreds of original engraved images of lathes and try to find a match.
The site mentioned in the second post is not as complete as far as late 19th century American brands is concerned.
Or maybe one of the collectors here will recognize it and save you some work.
Larry