Ключевые слова: 5, 1974, animal, antique, burunduk, circa, correspondence, definitive, design, eutamias sibiricus, fauna, heritage, historic, hobby, isolated, issue, korea, mammal, old, philatelic, philately, post, postage, postage stamp, postage stamp image, postal, postmark, rodent, series, south, squirrel, stair, stamp, vintage,