Manufactured: c.1889, Cleveland, Ohio
Bobbins: Standard's own
Needle: Regular 15x1
Feed: The manual suggests that it will drop. I haven't been able to loosen
the screw :(
Feet: Top Clamping
Hand wheel rotates away from you
Marked needle plate
I found this Standard Rotary Treadle at a nearby antique mall, actually the same place where I found my other one! This one had a full set of Toof's attachments and a manual. I especially like the cover or "coffin" top and the fact that you don't have to handle the head to sew with it.
If you are interested in the Standard cabinets, The Treadler's Village has a Standard Sewing Machine Catalog on-line. According to that catalog, this is the "Style 3" cabinet.