yes, 767 is Royal Blue, but the 57 sheet I have shows #780 for a 2 tone with Royal Blue {L}ower and Alpine Blue [lighter] for the [U]pper - I believe the "A" suffix was for certain colors that were never used in combinations, and the other suffix letters had to do with cab body style, so more about particular pattern [B=panel, J&K=fleetsides] .... one indicator is that 2 tones had wheels painted the lower color, single color trucks had black wheels .... and consider that a truck already painted one way may have been "touched up" to meet a special order
Bill
