FREDRICK L. ANDERSON 1900 to 1990 made the Anderson Steel Decoy in San Francisco at BC Metal. They were made 1928 to 1930 and they made about 10,000 of them.  All were pintails and they sold for $20 a dozen unpainted.  They are stamped in the metal on the bottom "ANDERSON".  See "WILDFOWL DECOYS OF CALIFORNIA" page 334 for pictures and more detail