Excellent plus to Mint condition, Original M1863-64 Springfield and contractor hammer. The original cutter marks are visible on the face of the hammer. There are no nipple marks from use on the face of this hammer.  This will fit and function perfect. This is the correct hammer for all M1863 and M1864 muskets. The main contractors were S. & W.T.C for Massachusetts and Bridesburg .
This is an original part and may not fit reproduction muskets.