original and intact c. 1910-20 american antique industrial revolving type factory fan blade comprised of cold-rolled sheet iron with unique riveted joint steel patchwork. the exact fabricator is not known. purportedly came from a huge automotive assembly plant. the incredibly heavy blade is affixed to a machine solid bronze housing or hub. the double-sided blade has been brushed down the bare metal and sealed with a clear coat lacquer. two identical fan blades are available. priced individually. measures 79 x 18 x 8 inches.