During 1967 production San Jose changed the style of service specification decal they typically applied to the drivers side shock tower.
The earlier version (shown below) is basically a mylar surface with black writing and thin border. Basically the same decal used on 66 Mustangs
The later version changed the lower box as can be seen on the original example below
+++++++++++++++++++++++++++++++++++++++++++++
Looking through my collection of pictures of unrestored cars the change point is far from exact. Examples suggest that both decals were being used during Nov 1966 - mid Jan 1967.
Earliest (so far) late versions 7R1145xx and latest early version documented 7R1627xx