English; Bullock box iron with brass sole. Dates to the 1800s. Measures 4 1/4 x 5 1/4". The companion trivet is engraved E.M. Sold by Hartzell's Auction Gallery at the Balestri Auction on 7/12/18 for $3000.
"The name slug iron or box iron applies to those irons that are heated by inserting a hot slug of metal into the iron cavity or box. The slug heating technique kept the bottom of the ironing area free of ashes and soot which resulted in an improved ironing practice." David Irons, More Irons By Irons, page 22.