Read the stamp
Cast iron marks
Among cast iron marks, an unmarked skillet needs these combined features; a single number such as 8 is shared by many manufacturers.
Logo, size and pattern
Look across the pan base for GRISWOLD, WAGNER WARE, LODGE or a foundry location. A handle number commonly denotes size, while an extra letter can identify a pattern or mould. A heat ring is a construction feature.
What to check next
Compare the base lettering, heat ring, handle opening and mould marks as a group. An unmarked skillet needs these combined features; a single number such as 8 is shared by many manufacturers.
