I don’t usually post partial planes or parts planes, but this is rare enough I decided to make an exception.
Both the cutter adjuster and the throat plate are damaged and it is missing the cutter and the cap. But the only other time I’ve seen one of these was in PTAMPIA and Plane Makers of Wilkes-Barre by John F. Rumpf, but it’s the same plane in both books.
Excerpt from John F. Rumpf’s book,
This model is similar to the plane specified in Siegley’s Patent 510096 issued December 5, 1893. The bed is cast iron with steel sides pinned to it. The bottom is corrugated and the throat is adjustable. Adjustment is accomplished by loosening the knob and sliding the entire front section of the sole. The frog is pinned to the sides. The lever cap is adjusted against a lever bar and serves as a chip breaker. Adjustment of the cap relative to the cutting edge is done by two set screws one on each shoulder of the cap. The iron has grooves in the back to mate with the fork to raise or lower the iron. A knurled steel knob engages the fork. The knob and tote are beech. The tote toe is attached by a machine screw and the back is secured by a wood screw that passes up from the bottom of the sole. This screw is countersunk and does not hinder use of the plane. As is the case with Siegley’s No. 5 Block, Shoulder and Rabbet Planes and early Adjustable Planes, this plane is unmarked. This plane is extremely rare.
Additional Jacob Siegley Hand Plane Examples