[Mark IV]

Those emblems are actually made by the Keeler Brass Company (note the "KBC" on the lower left corner) and not ACSCO.

I was given a quick course on emblems by Ray Blanchard who ran R.W. Blanchard, one of the die-cast suppliers to Ford and Chrysler. Ray explained that most all parts have a "caster's I.D." on them. His parts had "RWB" on them. RWB supplied Ford a lot of 60's-70" pieces as well as many of the CryCo muscle cars pieces. He also told me that he ignored the tooling destruction orders and had many of the dies in his garage.

Another common supplier is "Tri Delta Casting" who used a rounded end triangle with "TDC" inside it.