This is a cast iron reproduction of an original tool that was made by the Allen Electric Mfg/ Company in Detroit, Michigan during the Model T era. It has the name and original part number cast on the face.
It is a Model T generator armature support that is used when driving the generator gear pin out of the generator drive gear.
It properly supports the the armature shaft so you don't bend the shaft when driving out the pin.
Excellent quality, strong cast iron, weight 6-1/2 lbs.
Length -8", Width - 4-1/2", Height - 3-1/4".