An old very scarce brass bullnose plane similar to an Edward Preston 1347 Bullnose rabbet plane.
Not a plane we've seen before. Possibly an Edward Preston prototype plane.
The cutter is a William Marples plane iron. The cutter doesn't quite span the full width of the plane.
For similar general info see the FindMyTool.co.uk Edward Preston 1347 plane review.
Plane Width: 26mm
Condition: the cutter doesn't quite span the full width of the plane, small slightly raised bit at side on very back corner, please see photos for condition.