We list 23 of the rarest and most valuable of all stamps ever printed. Back side of postcard 3 0 2 months ago. Stamps set of love season Vintage postage stamp colorful silhouette 47 7 9 months ago. However, if the old postage stamp is unused but it was affixed onto a stamp album using a stamp hinge, its value will still decrease. Great set of labels with special offers 1, 22 1 Vintage postage stamp ago.