My best guess it that it is one of the plaques that was awarded to a Marine many years ago. If you look at the roster below, you can see the dates and awardees names. From 1920 to 1930, it was won by Marines 5 out of 10 times. I believe the "master" trophy remains at Camp Perry, Ohio while indvidual trophys are given out to the yearly winners. Perhaps that is what is hanging on the wall?
The National Trophy Rifle and Pistol Matches trace their history to the 1903 legislation that established the first National Matches and appropriated funds to acquire the National “Dogs of War” Trophy, which continues to be one of the most prestigious team trophies in U. S. marksmanship. When the National Trophy Matches expanded to include pistol events, the first trophy awarded was the General Custer Trophy awarded to the National Trophy Individual Pistol Champion. The Custer Trophy was first presented in 1904. The Gold Cup National Trophy Team Trophy was first awarded in 1920. Today, the National Trophy Pistol Matches provide service pistol national championship competitions that preserve the finest traditions of military marksmanship in the United States. A total of 22 different National Trophies are now awarded during the National Trophy Pistol Matches.
AWARDS. The winner of the National Trophy Individual Pistol Match receives the General Custer Trophy (the competitor receives a trophy plaque and his/her name is permanently engraved on the trophy; the trophy is retained by the CMP on permanent display at Camp Perry), a General Custer Trophy medallion and a presentation M1 Garand rifle. The M1 Garand rifle will be prepared for presentation by National Match Armory; Rendon, Texas;
www.nationalmatcharmory.com/.
2006 trophy winner is SFC ADAM SOKOLOWSKI, USA 292-09X
GENERAL CUSTER TROPHY WINNERS (USMC)
INDIVIDUAL SCORE YEAR
SGT J.M. THOMAS, USMC 1921
SGT J.M. THOMAS, USMC 1922
SGT B.G. BETKE, USMC 1924
1SGT M.T. HUFF, USMC 272 1928
GYSFT HENRY M. BAILEY, USMC 262 1930
TSGT W.L. DeVINE, USMC 281 1949
MAJ T.E. BARRIER, USMC 285 1951
MSGT J.C. PALMER, USMC 287 1953
1LT W.W. McMILLAN, USMC 291 1956
SSGT FRANK O. WRIGHT, USMC 291 1958
CPT WILLIAM W. McMILLAN, USMC 294 1963
MSG WALTER K. JONES, USMC 291 1973
CWO3 FRANCIS A. HIGGINSON, USMC 292-12X 1977
SGT MITCHELL R. REED, USMC 290-12X 1979
CPT PAUL A. BERNA, USMC 287-07X 1986
MGYSGT R. RODRIQUEZ, USMC 289-12X 1989
SSGT MITCHELL R. REED, USMC 291-10X 1990
GYSGT MITCHELL R. REED, USMC 288-08X 1992
SSGT MARIO A. LOZOYA, USMC 287-07X 1993
CWO3 PAUL MALSBURY, USMC 288-16X 1994
GySgt BRIAN ZINS, USMC 289-10X 2003