The 78 Duplex Rabbet Plane was manufactured between 1884 and 1984 in the US under model number 12-078. A similar version is still being manufactured under the model number 12-978.
Dimensions: 8-1/2 inches long
Cutter: 1-1/2 inches wide
Construction: Cast Iron
Finish: Nickel plated trimmings
Used to make rabbet and filltster cuts.
Click on the attachment below to view the original instruction manual for the 12-078.