So my "original" car with the horizontal decal is not identified as to where it was built, so I researched further. I have now documented 5 unrestored 1969 San Jose cars, NONE of which even have this service decal installed. One of these is an A/C car, so it is possible the decal is just lurking in some odd place and can't be seen.
Based on this information, I now think it is possible (maybe likely?) that San Jose did not apply the service decal.