A type of shadow mask used in CRTs. There are two methods. The first is the aperture grille used in Sony's Trinitron monitors, which uses vertical phosphor stripes and vertical slots in the mask ...

Then there's the Shadow Mark treatment ... That's the highest I've seen so far on a 1970 AMX that's not an ultra-rare Super Stock racer. For reference, the most expensive 1970 AMX ever auctioned ...