Wow, those have been made in Spain and Italy since the late 50's. so made in USA , maybe a Colt for one of their repro runs, even though the 2nd and 3rd gens were forged in Italy they were finished in the USA and could be stamped as such. I've seen a 2nd gen complete set with a USA stamped flask, but it also had Colt Pat and Hartfrod on it!