19 hours ago, Anna N said:
It is cast iron, one of the nickel-plated ones. This one with a "slant" logo, earlier than the "large block" logo. Introduced 1905 and used until 1920. The heat ring shows it is an earlier one, the smooth bottom introduced in 1914.
They are not as desirable to collectors as the plain cast iron and sell for much less.
The one you found is worth about $10.00