U-shaped steel box, 3 mm side walls (230×60 mm), welded to a 6 mm sole (130×19 mm). Mouth: 2 mm wide.

Front insert: 13.7/7×1.2×6 cm wooden block, glued in.
A 5 mm angled metal insert acts as a support for the wooden wedge.
Rear wedge-shaped wooden insert (15/2.8×1.2×6 cm) serves as the iron bed. Top edges are beveled.

Iron: 19 mm (¾″), shaft 10 mm with hook
Bevel on top ~20°, bed angle ~26° → total ~46°

Mark: H S.HOWARTH SHEFFIELD