BT.601 NTSC Primaries are usually expected to be SMPTE 170M (SMPTE-C). BT.470 M (NTSC 1953 primaries) is considered an obsolete specification, but you may find it randomly on older DVDs.
BT.601 Matrix is identical between BT.470 B/G (PAL) & SMPTE 170M (NTSC)
BT.601 Transfer curve is identical between BT.470 B/G (PAL), BT.470 M (NTSC), SMPTE 170M (NTSC), BT.709
I believe that the Blu-ray spec states that SD NTSC is expected to be SMPTE 170M for Primaries, Matrix, and Transfer.
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