uk letter card of 1892 with an imprinted stamp and perforations.
u.s. postal card of 1881 with an imprinted stamp.
postal card of 1895 with an imprinted stamp.
cuban postal card of 1878.
a united states stamped envelope of 1876.
a registered envelope for kenya and uganda from 1930.
a scarcity of postage stamps during wwi in german east africa was the cause for this handstamped envelope. any indication that postage is prepaid (see top right handstamp) is what makes the item postal stationery. the fact that this indicium was applied to an envelope makes this a stamped envelope.
wrapper printed in us for occupied cuba, 1899.
a piece of postal stationery is a stationery item, such as a stamped envelope, letter sheet, postal card, lettercard, aerogram or wrapper, with an imprinted stamp or inscription indicating that a specific rate of postage or related service has been prepaid. it does not, however, include any postcard without a pre-printed stamp.