From my 70 Nova with a 04A build date, looks like the jack was used once or twice at the most.
The hook says "CHEVY II 1968" and had a mfg stamp of TTD, it's dove grey.
The base is darker on the bottom than the top and has no mfg stamp. The base has a greenish tint to the grey paint.
The jacking mechanism has the same greenish tint as the top of the base. Has mfg stamp TTN on the up/down latch.
The rivit is stamped "0C" .
The mast is a tube shaped like a yeild sign and has gold tint cad. Stamped "Patent 3163925".
The rubber sleeve is one piece and 24" long.
The jack handle/lug wrench is definitely black and still has most of the paint left on it.
It's a real "survivor",
sorry Bloomington Gold guys.