While rummaging through boxes to try and clear space, I found a cache of my old electronics things. Among them, my original multimeter, a Micronta 22-211A. I probably purchased it 1986-1988.
I had to set my power supply to 10.07 volts to get the Extech to read 10.00VDC, but the Micronta agrees with several progressivley cheaper multimeters, so...who knows.