'BBC and Marconi Broadcasting Anniversaries - Barry College Cover' (13-Sep-1972)
Issue Date: 13-Sep-1972
Postmark Type: Special Handstamp
Postmark Location: Flatholm Island, Cardiff
Address Type: Label
Stamp 1: 9p Oscillator and Spark Transmitter, 1897
Comments: This is the only copy of this cover I have ever seen as it is so scarce, and I believe it was only ever issued with the single Marconi Transmitter Stamp. The original Barry College insert is still inside, with the envelope never having been sealed. Wonderful!
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