These are the castings from the patterns posted here a few years ago.
"Camelback" straight edges with dovetail reference one edge, box way
reference on opposite.  As rough machined and thermal stress relief.
Also photos of the finish scraped tool, and handles.  The handles provide
insulation during use to prevent heat from handling casing the top
bow to expand, and hence bowing the flat.  Also provide support when 
the tool is inverted.