International reply coupon
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An international reply coupon is a coupon that can be exchanged for one or more postage stamps representing the minimum postage for an unregistered priority airmail letter sent to another Universal Po
A British 1 Shilling IRC issued in 1959.
QSL card
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A QSL card is a written confirmation of either a two-way radiocommunication between two amateur radio or citizens band stations; a one-way reception of a signal from an AM radio, FM radio, television
A 1925 QSL card from amateur radio operator Bill Corsham, G2UV.
QSL card from Syd Preiss, Nairne, South Australia to VK3BQ Max Howden. Many shortwave listeners printed their own QSL cards to report reception.
QSL card confirming listener reception of AM radio station KXEL in Waterloo, Iowa.
QSL card.