If you provide good photos of a pistol, with the full serial number visible, I will attempt to provide, free of charge, year of manufacture or shipment/procurement.
In the Gallery I show more than (500) M1911 and M1911A1 pistols to enable Subscribers of the site to compare pistols to the examples shown and determine year of production. In many cases, month and year might be determined. Also in the Gallery are nearly (150) other misc. USGI pistols and revolvers, Colt Government Model pistols and pistol rigs that are foreign manufactured and were captured by U.S. troops.
Some pistols and revolvers were shipped out of strict numerical order. Dates of shipment or procurement are not able to be accurately determined without extensive research.
With respect to proprietary and copyrighted material concerning shipping information provided in various forms by various authors, I have elected not to provide serial number tables on this site. I provide research services for pistols and revolvers with some of the M1911 Solutions I offer to paid subscribers. With those services, I provide extensive pertinent information, as well as accurate serial number information (when I personally inspect a handgun. Please contact me for more information.
Charles W. Clawson does provide shipping and procurement information for the M1911, M1911A1, M1917 revolvers and commercial Colt Government Model pistol variations (1912-1970) in his books Colt .45 Service Pistols, Colt .45 Government Models and Collector's Guide to Colt .45 Service Pistols 3rd Edition.
Charles W. Pate provides some shipping and procurement information for many secondary handguns of WWII in his book U.S. Handguns of World War II. John W. Brunner provides some shipping and procurement information for Colt M1903 and M1908 pistols in his book The Colt Pocket Hammerless Automatic Pistols II.
I would caution users about relying on serial number information provided free online. Many of those tables, and tables in some other reference books, contain conflicting information I believe to be inaccurate.