CENTENNIAL stove top heater, PATENT 1876, with wings that slide apart to access one sadiron. Measures 14" X 9 3/4". Sold by Hartzell's Auction Gallery at the Balestri Auction on 7/12/18 for $70.
"The devices to heat irons are as ingenious and as novel as the irons they heated." David Irons, Irons By Irons, page 145.