1944 Sovereigns Provisional
||On 1½d Sovereigns
||First Day Cover - 1 May 1944
|... 10d (75a)|
Large remaining stocks of the 1½d Sovereigns stamp from 1940 were
surcharged 10d to cover the rate for the newly introduced airgraph
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The airgraph service photographed large amounts of mail and
reduced it to thumb-nail size images on reels of microfilm. These reels
were then shipped saving valuable cargo space for war materials. The system
also eliminated the threat of spies using microdots or invisible ink to
send reports as any microdots would not be photographed with sufficient
resolution to be read.
Once the reels arrived in the recipient's
country they were developed and printed on lightweight photo paper about
one quarter of their original size and delivered to the addressee.
This page was last updated on 18 Jun 2021
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