[Mr70]

I found my Fisher book and it does not show a code as you have stated.The closest code I can find is #293B used in 1987 as Silver.
I called a few who have Lacquer under their finger nails & all said they too can not find that code.Not in Chrysler-Ford or AMC paint books too.Most believe it is an in house reference no. to paperwork supporting the color change.
I agree,especially after reading the current "Chevy Rumble" Magazine.
In it,they Feature a 1970 SS Chevelle,built in Canada,but with Special Order Monaco Orange paint.On the cowl Tag is stamped SP4644,as well as 4644 written w/chalk on its firewall.
They too reference this no. to mean in house paperwork,supporting the color change.
Even though in 1970,a Monaco Orange Cowl tag code was --,some plants did their own thing,and went against the recommended way of doing things.
Your Baltimore 1968 is most likely the same.