Not PAINT OK markings (those ended much sooner (that was only the fill in guy) but instead paint inspector stampings would have been applied by two inspectors typically. One at the line and one at the individual parts paint line.
Normally one guy would stamp the passenger side of the cowl above the firewall pinchweld while the other would stamp the head light buckets, fenders, an hood. Every year at San Jose used 2-3 different styles of paint inspector marks depending on the time period when they settled into the single name style