the acoustic non-cutaway series headstocks on the 5-8 (rosewood) & K(oa) (ebony) have gloss finish
the 600/900/koa & PS acoustic electrics, DDSM & DMSM have gloss ebony headstocks,
while the baritones seem to have satin headstocks & the 12 frets gloss (rosewood on those)
it has no correlation to whether or not the top has a sunburst finish -
the 200/500/700 & 800s have a satin finish headstock, 'burst or no
also, all of the 'standard' electrics have gloss ebony headstocks,
save for the T5-X, SB-1 & 2X (satin necks with satin headstocks)