+1 Bob . Natural aluminum finish on late 66-67 BJ -BK carbs. "I" haven't seen a green tag on a carb after '65 ( date stamp). The stamping font differs from a Holley to an Autolite (until '69) in case no one noticed. Another reason why the S2MS tag is a fake.
I don't know if it applies to green painted versus bare aluminum tags or not but looking through 1960s Holley® specification documents they normally made significant changes every calendar year in time to get covered by the June printing of latest updates. So, 1967 427 Cobra with a 1966 April 2nd week green tag, anybody got a picture of a green tag dated after that or a bright aluminum tag in the May through July 1966 time frame?