1911A1 advice needed

Hello to everyone. Nice site. Hope someone can help me out. Been here for a few days and noticed your interest in the WWII 1911A1s. Bought a Colt recently, but when researching serial numbers here, have discovered that it is a US&S frame with a Colt slide. The date of frame is 1943. The Colt slide does not have a serial number on the end(or anywhere else, that I can see). There is a stamped "P" on top of slide and a stamped "G" on the bottom of the slide over the ejector. Pistol came with 2 barrels, one a High Standard, one a Singer, and a "COLT 45 AUTO" magazine. Also, included was an original brass cleaning rod, a holster marked, "U.S." "Graton & Knight Co." "1943", and a box of ball amunition from the "Evansville Ordinance Plant" "Lot E.C. S-S25233.
Now, what the heck do I have??? Might add the slide and frame appear to have "worn in" together. Can not see any refinishing, just normal wear you would expect to see after 50 years. Disappointed that this is not a pure Colt, but the US&S makes it interesting.
Have a pic, but not sure how to get it on here. Thanks for your time, CEC