1955-1st series trucks had a white grill as standard equipment.
"Same "bull nose" grill as used in 1954; but, this year the entire grill was painted Waldorf White, with black inner bars. The chrome grill had Waldorf White inner bars."

I think that 55st painted grills had black "CHEVROLET" on the top grill bar.
I would think that chromed grills had white "CHEVROLET" on top grill bar?

1954 standard "grill is painted body color with Thistle Gray inner bars (on all models, except Commercial Red - Argent Silver inner bars). The chrome grill had Bright White inner bars. White "CHEVROLET" is displayed on the top grill bar.