I saw a number of reputed National Match 45's at a recent show? All had arched mainspring housings with lanyard loop, 1911A1 style hammer and grip safety and large fixed sights with undercut ramp on front. Only I had a NM part # on the bbl bushing. Only 1 had NM markings on the bbl hood. United States government property on the left side dust cover. do these sound authentic?