This heavy pair of brackets probably came out of a hardware store. They may have also been made for barn use. They were manufactured by Schreiber & Conchar Mfg. Company of Dubuque, Iowa. The cut outs on top of the brackets remind us of the harness hooks used in hardware stores—like this one of ours. The pair, however, could also work for a shelf support.
Each bracket has a back plate that is 7 5/8 inches long and 2 inches wide. It is fastened to the wall with three large counter-sunk screws. The arm extends 13 1/2 inches from the back plate. Since each arm has an under-brace, this pair can withstand a great deal of weight.
Each cast-iron bracket weighs 2 lbs, 10 ounces. Screws are not included.