It really depends upon the overall condition of the piece, and if it was an Ordnance rebuild, or if it was something that had been commercially refinished.
If it's an Ordnance rebuild, then the mis-match of parts is to be expected - as is a refinish, because Uncle Sam really didn't care that some future collector might want the piece to remain intact - he wanted it to be 'combat serviceable', so that's what he did.
Coming out of Chambersburg in the 1960s meant that it was 'probably' a DCM pistol - perhaps sold through the NRA - perhaps not.
Best case scenario - it's an Ordnance rebuild, and it has the original Government Bill of Sale - as such, it has less value than one with original finish, but it 'is' popular, and someone will chime in and he more than happy to price it for you.
TexTan made good holsters, too - well-built and sturdy, if they're still tan and clean and not over-oiled, they're sought after.