ac45 "c" block matched with a FN frame.  I believe this to be a much scarcer example that the ac44 with the FN frame.  Most FN frame ac45's that I have seen are the "c" block mismatches.  Finding a "c" block matched is not real easy but to find one with a FN frame is quite difficult.  This example not only has the E/140 on the left side of the frame but also has the Ml on the left rear trigger guard web.  It also just has the one E/359 inspection stamp on the right side of the slide which is typical of guns in this serial number range.