From 1882 to 1889, they manufactured the first successful slide action repeating shotgun. Designed by Christopher M. Spencer, who also designed Civil War era Spencer military carbines. Shotgun came in both solid and take-down, in 10- and 12-gauge. In 1890, Francis Bannerman & Sons of New York, bought patents and machinery and moved the operation to Brooklyn, New York. They produced what is known as Spencer Bannerman models from 1890 to 1907. Later Bannerman models are worth 50 percent less than Spencer models. NOTE: Add 20 percent premium for take-down model; 10 percent premium for 10-gauge models.