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RRundstromRestorations

RR-032 · Cast iron restoration record

Reading a Griswold No. 7 hidden beneath carbon

A $10 yard-sale skillet shows how heat rings, handle geometry, and fragments of a mark can point toward an identification before cleaning begins.

Form · No. 7 heat-ring skillet

Carbon-covered underside of a Griswold No. 7 heat-ring skillet in the Rundstrom workshop
Exact inventory piece · Documented before treatment so the starting condition remains part of the record.

The piece and its question

How much can be learned before the maker’s mark is fully visible?

The current record starts with the untouched casting. Cleaning, bare-iron inspection, and matched after photographs will show which identification clues and condition details survive the buildup. The reveal matters; the condition record matters more.

What the iron shows

  • Heavy cooked-on carbon covers most of the underside.
  • The heat ring and handle geometry remain visible identification clues.
  • Enough of the central mark is visible to support a working Griswold identification.
  • The cleaned casting must still be checked for cracks, movement, erosion, and pitting.

Learn from the piece

Related field notes

When the maker’s mark is hiding under carbonHow to photograph cast iron for identification

Continue with Rundstrom

From evidence to action

Request restoration for your piece Read the restoration standard