For your consideration, we present for sale Union Pacific and Northern Pacific poster stamps from the teens of the Twentieth century. Six (6) individual stamps are from the "Union Pacific Panama Pacific International Exposition San Francisco 1915" titled, "Meet Me at Old Faithful Inn" which is in Yellowstone National Park, and fifteen (15) stamps from Northern Pacific's Wonderland Series #2, five (5) and #3, ten (10). Depicted are vintage scenes of Yellowstone National Park, both of the majestic wildlife and beautiful vistas. Stamps are in very good condition, no damages or marring noted. Measurements are 9.25"L x 7.25"W