WW2 Thompson 20 Round Magazine 5 cell Pouch, these were made by many manufactures throughout WW2 and first officially procured by the US Government in 1941.
This pouch is U.S. Stamped on the rear and manufacture stamped – General Shoe Corp. in Nashville, TN. in the inside of the rear loop and dated 1943, it is in NOS un-issued condition. It is one of the less common found (manufacturer) marked pouches.