Hello Ausmick,
Could the colour code BGS be a variant of "Bronze Green" Not sure what the S could mean??? My 1940 Holden Chevrolet just had Khaki on it so it was much easier to interpret.
I think Gina Vampire has a colour or paint thread? ..... Here it is Accessed April 25 2016 from,
http://www.mapleleafup.net/forums/sh...&postcount=259. I am not sure how helpful the link will be for you though.
I checked some old Holden clubs and they changed over from letters to numbers - maybe when GM took them over? So I drew a blank there.
Kind Regards
Lionel