Here's a look at three of the McLaughlin blackglass colors I find difficult to correctly identify: Olive, Olive-amber, and Amber. All three of the examples shown have Flat Drip Points (FDP).

I believe the Amber blackglass CD 106 McLaughlin should be considered rare. The one shown here does not have "U S A" embossed on the back. Interestingly, this piece has patches of green on the side about midway up from the base. (Please ignore the red streaks in the skirt, I have no idea how they got there.)