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tbobThe 1909 Obaks ARE condition sensitive and so the highest grades are 3s, 4s and 5s for most cards, when you can find them. Plus factor in that over half are the borderless variations which were handcut and won't grade and you see they are scarce as hen's teeth.
If I had to project which card sets will make the biggest jump in the next 5-6 years, I would include them along with other minor league sets like the bakery sets, 209s, 210s and 211s.