J.A.C ~James Arthur Chapman one of the makers that did not produce a great abundance of the '07's they later became just Chapman they were roughly stamped in about equal quantities but sources indicate that the J.A.C stamped ones are the rarer commanding a slightly higher price total WWI production figures are around 300,000 units.
Even with the frog/helve carrier its not worth the asking price I think in @1997 I procured a 1916 J.A.C for $100/Au