Yes, Hurricane, there were two distinctive "all-black" liveries for "A"'s.#
First - the livery which the ITG had A39 in from initial preservation until its reincarnation in BnT last year. This was all black, with the number in large numerals on the ends and the centre of the sides. No "roundel". After just a short time, they amended the sides - instead of a plain numeral in the centre, small numerals were put on lower body sides at each end, beside the driver's doors. In place of the large central numeral, a "roundel" (white letters, tan surround) was positioned. In each case, the usual white "flash" above the end cab windows was used, but the white lines didn't continue round the bodysides.
It might be nice to see one of the ITG's two "C"'s done like that.
It might be added that the "all-black" livery, in several variations, was used as standard between 1963 and about 1967 on all existing pre-GM classes; A, B101, B113, C, D, E and G classes.