[C10 - C90 Bill]

Dan,

Right, the main tell-tale sign is the Directional Lights. The style of them and location. The '66 and '67 were up near the Cowl and were the more narrow "Signal Stat" type as you have indicated. The '68 and '69's were moved up front and are the Larger Round type as shown in the above picture. In 1970, they went to the Square type. There are also other smaller signs that I look for including style of the Cab Lights, Side Emblems, etc to verify the year, the best I can.

Right about the Square light as well. It is about a 3-Purpose Light. Parking, Directional (and Flashers) and a Side Light built into it.

I also remember the Parking Lights in the Grille. Thought they looked pretty cool really, but I have never paid enough attention to them to try to determine what trucks got them and which didn't. Always just thought they were an Option really.

Bill