Is the Napa NMC M1874M for drum brakes?
My NAPA store couldn't answer that.
The bore is 1 inch.

I originally put a 1972 master with a 15/16" bore on it, but now NAPA only oiffers the M2044 (power) and M2067 (front disc) for 71-72.

The M1874M picture shows a dual master with a cap held down by a screw. I have seen these on some late-60 Mopars.

What other options do I have for a new master for 10 inch manual brakes?

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63 Signet / 10 inch front drums / weber 2bbl / HEI / 2.76 rear end

Uh oh.
NMC M1874M is a Cardone.

Napa masters are Cardone now?

But it is for manual drum brakes.

OK, I am getting a Raybestos MC36221.

Nevermind

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63 Signet / 10 inch front drums / weber 2bbl / HEI / 2.76 rear end

Napa remans have been Cardone for years. Pretty much junk that not worth installing.

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63 Valiant Wagon
225 - 4 bbl