A Mystaran Golem, which as the name suggests is made of Bronze. What is not apparently obvious from the name is that it filled with a Fiery Blood.

Expert Rule Set, pg. X33 (1981 edition) or pg. 50 (1993 edition)
Rules Cyclopedia, pg. 180

Monstrous Database stats for OD&D

3e stats by Andrew Theisen from Legend of the Bronze Warrior (see the Apendix) from the Mystaran Almanac, Book III, Volume IX (1018). Also here

3e stats by Simone Neri July 2005

See it's Monster Lore entry by Gary Davies

4e stats by John Walter Biles Jan. 2009