Here is some good info:
http://sightm1911.com/lib/history/rebuild.htm
Don't confuse the arsenal rebuild markings with the inspectors marks which were put on new guns accepted by the govt. and a P means it was tested with a proof round.
Arsenal Rebuild Marks:
AA = Augusta Arsenal
AN = Anniston Arsenal
BA = Benecia Arsenal
MR = Mt Rainer Ordinance Depot
OG = Ogden Arsenal
RA = Raritan Arsenal
RIA = Rock Island Arsenal
RRA = Red River Arsenal
SA = Springfield Arsenal
SAA = San Antonio Arsenal
Inspector Marks:
CSR: Charles S Reed Colt S/N 717,282-723,000
EB: Ernest Blind, RIA inspector
E.E.C: Edmund E. Chapman Remington UMC S/N 1-21676
FK: Frank Krack, RIA inspector
GHD: Guy H. Drewry Colt S/N 845,000 to 2,360,600
GHS Monogram: Gilbert H. Stewart. Found on Colt M1911s (SN 101,500 to 230,000), M1907, M1917, M1903, and M1 rifles at different periods. Stamped after finish.
JKC: Lt. Col. James K. Christmas, Singer frames (or John K. Clement?)
JMG Monogram: J.M. Gilbert found on Colt 1911s from 1917 to 1918 (SN 230,001 to 302,000). Stamped after finish
FJA: Frank J. Atwood. Found on Remington Rand and Ithaca 1911A1s. Stamped after finish.
JSB: John S. Begley (civilian), late Colt M1911A1 frames
RCD: Lt. Col. R. C. Downey, Union Switch and Signal frames
RS: Robert Sears Colt S/N 723,000 to 750,500
WB: Waldemar Broberg S/N Colt 750,500 to 861,000
WGP Monogram: Walter G. Penfield, Major Colt S/N 1-101,500
WTG: Walter T Gorton Colt S/N 700,000-710,000
Last edited by mack7.62; 05-08-19 at 13:28.
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