I don't think so, to early for a 61/2" per the S/N I think this is a type 2A BKH-34Nice catch. Not that it matters if you're happy with it, but it may have started life as a 6 1/2".
Notice the sight base solder seam and barrel discoloration on the right side of the front sight. Not a an area where the blue wears off. More likely from resoldering the front sight back on after cutting the barrel. Then touched up with cold blue.
Sometimes it's good to be wrong, this is one of those times for me! Maybe the sight just needed to be resoldered.I don't think so, to early for a 61/2" per the S/N I think this is a type 2A BKH-34
Anyway a nice old shooter