I looked for this exact model; 3 dials on the front one on the back. An Ebay find.
Incredible engineering; engineered and designed by people who USED the machine because it has some very unique features. It also has basting stitch, ZZ, and multiple stitch ZZ. Also it has the 5:1 gear reduction system!
It took several hours to get it cleaned out. The bobbin tension seamed off and the screw did nothing until I discovered that the spring was packed with fabric fuzz and so would not apply the correct pressure.
The rear covers fastener points are all broken and the paint didn't stick completely to them.
On the rear cover you see the discoloration over the light bulb.
I didn't get the flatbed with it and the manual cover is missing.
During clean up I took the pedal apart, its all Bakelite
The amazing thing is the design of the coil and the electro-mechanical connection
On the right of the ceramic coil instead of just a slider made of copper it has a carbon wheel; never seen anything like it.
A little History