Antique vintage Victorian Cast Iron Warm Air Cool air wall signs hvac 6 1/2 x 2

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Antique vintage Victorian Cast Iron Warm Air Cool air wall signs hvac 6 1/2 x 2:
$9.99

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Not sure the origin of these?

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Antique vintage Victorian Cast Iron Warm Air Cool air wall signs hvac 6 1/2 x 2:
$9.99