These Post Office stamps were affixed to specially designed envelopes and postmarked on the first day that the stamps were issued.
13.09.1972 | Marconi/Kemp First Wireless Signals, Postmarked at Ballycastle, AntrimBUY NOW £45
5p Horn Loudspeaker
7 1/2p TV Camera
9p Oscillator and Spark Transmitter
Producer/Series: Official Sponsors
Notes: NB Not first day of isssue. This card is postmarked on the actual anniversary.
Stock remaining: One Left!
Presentation Pack (43)
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