Ключевые слова: aged, albert, america, american, cancellation, cancelled, celebrities, collection, commemorative, communication, correspondence, einstein, famous, history, independence, mail, memorial, nation, national, old, old fashioned, paper, patriot, patriotic, patriotism, philately, physicist, physics, portrait, post, postage, postal, postmark, retro, send, stain, stamp, stripes, symbol, symbolic, united, unity, usa, used, vintage,