Hello, Can anyone help me out with a little history on this double bit axe? Any ideas on the maker? Time period? It's 10" W with 4" Bits; forge welded/bit welded and stamped U.S.R.S. (United States Reclamation Service). It is also stamped with what appears to be an "8" inside of a square. Thanks for any information. https://flic.kr/s/aHBqjBJf3H