An old Stanley block plane which we are sure is a No. G12-020 - we can't find a model number on the plane however it is almosrt identical to another G12-020 we have.
Plane Length: 6" approx.
Plane Width: 51mm (2") approx.
Cutter Width: 42mm
For general information about the G12-020 plane which we believe this plane is, see the Stanley G12-020 Plane Review on FindMyTool.co.uk
Condition: all parts move freely, please see photos for condition.