This period line thrower is built on a cartridge converted Sharps New Model 1863 carbine. The rear sight dovetail slot has been filled, the saddle ring bar has been removed, and the barrel is smooth bore. The action retains the Sharps and R.S. Lawrence markings, and the serial number is stamped on the upper tang. The buttstock is stamped "SL T4" on the right side, and a "DH" cartouche appears on the left side. The throwing rod and rope are included. Several models of line throwing guns have been used by the U.S. Navy and Coast Guard. Early line throwing guns were built by modifying trapdoor and Sharps actions.