1200 matte is gonna be semi-shiny. If it's like their other semi-shiny balls, it's 800-grit sanded (600?), then a heavy coat of polish, then a light sanding with a well-worn white pad. Just enough to take the shine off but not enough to dull it.
But like Jeff said, I don't think it's 1200-grit matte, I thought it was polished.
SH