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It's not a 71 MC, which is a single reservoir
I'm not a big fan of rebuilding slave/wheel cylinders, never mind masters..............why not just resource a new one for your year?
If you have already modified the brakes to discs in front, why not source a newer master from your local pick-n-pull, say from a 90 4runner??
OK, I'm probably off here but here's what toyodiy shows as late as 75 in US.
One question. does it go SSSSSSSssssssssssSSSSSSSSSS
Looks like an aftermarket copy of the 75-79 front drum MC.
Not an exact copy, though. Check out the location and orientation of his front bleeder screw, compared to that in the drawing.