Can You Identify These Vintage Cast Iron Ramekins?

Good Questions

Q: Hi! I recently saw these ramekins and I am completely enamored of them. Unfortunately, I don't know anything about their provenance. Can you help me identify them?

They are enameled cast iron and quite heavy. There are no markings on the bottoms.

Sent by M

Editor: We would love to know the source of these ramekins, too! Readers, do you have any clues?

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(Images: via email)