This Ithaca M1911A1 is an early production example with the serial numbers starting at 856561. Shipping destinations on these early pistols are hard to trace as Ithaca had an out of sequence manufacturing process for the serial numbers.
This particular Ithaca is built using a leftover receiver from WWI. In December of 1942 Springfield Armory shipped 6,200 surplus receivers so that Ithaca could meet their production schedule. The majority of these were unfinished Colt receivers but some were refurbished with assembly and acceptance marks. Pistols are observed in this range from 856405 to about 870000. They are able to be identified by the letter "H" stamped at the 12 o'clock position from the disconnector hole and often the heart shaped cut-outs seen under the grip panels.
The inspector stamp of FJA is for Colonel Frank J. Atwood. He was the Army Inspector of Ordnance at the Rochester Ordnance District from June 15th, 1942 to March 31st, 1946. He would inspect the total production of the M1911A1 pistols manufactured by Remington Rand and Ithaca.