U.S. Rifle Musket M1861 (CSA SPAR 1523). Manufactured by Springfield Armory, Springfield, Ma. in 1862. Stock: C.E. MC.D. O.S. CO. G. 2ND REGT. Left side: P.H.F. (letters formed by brass shoe nails). 6-pointed star on left side of stock in brass nails, and forward of triggerguard in red paint. T is stamped in stock between lock screws on left side.
Springfield Armory NHS, US NPS
<a rel="nofollow" class="external text" href="https://www.nps.gov/spar/learn/historyculture/images/M1861_butt_SPAR_1523.jpg">Springfield Armory National Historic Site (U.S. National Park Service Official Web-site</a>