Hey Old Dog....I am not an expert. Like you, being in Montana, I have not seen many G&B 67 10 Gallons....but, several years ago I ran into one south of Bozeman, and I had made arrangements to buy it and got there the next day, and the guy sold it the night before. Needless to say, I was not a happy camper.... but I do remember that it had what looked to be original gallon markers on the outside. I did get to see the pump; it was in an old shed and had a couple of inches of dust. He said it came off that farm and had been in the garage for 50 some years. Anyway, that doesn't prove anything, but thought I would pass it along. Still ticks me off he went back on his word. LOL