I have seen multiple copies of each variation in person and have seen various pedigrees. Variants 1 & 2 have a rose coral background on slightly glossed paper stock.  The rose coral is a delicate color that is very affected by the yellowing of paper as it ages. Variant 3 is has a tomato red background on glossy stock.  It is impossible to confuse with the first two variations. I've put scans of the different variants below that I scraped off the interwebs.