I know, this is weighing late on this topic, but...
my local PPG guys (Martin Auto Color in Rancho Cucamonga) researched this for me and came up with two colors. The 22581 mentioned and 2326. My car had been repainted some time before 1974, so there were limited spots where the original color was available. The best I found was under the clips for the hood to cowl seal. The 2326 was an excellent match for the Honey Gold. The 22581 was too green.
My suspicion is that the 22581 formula was a match to a car that was original, but had faded over time, enhancing the green that was in the color. Just a guess.