Large Antique Iron Barrel Key Gate Door with Stamped Marks

This is a 4 3/8 inch (11 cm) long antique iron barrel key. It has a cut bit, and is uncommonly large for a barrel key. The key is also unusual in that there are numbers stamped on the side of the bit. It may have been a key to an old door or gate. It has a thin layer of old rust, but is in otherwise good shape.