UNDERCOVER ADDRESSES / POLAND 1943
Uprated German postal stationery Post Card from Posen to R. Alexandre Herculano 41, Lisbon – the undercover address for the Polish Red Cross in London. This ‘sardine card’ has been examined and tested for secret writing by German censors. It bears the red unboxed ‘Checked in the records of the Polish Red Cross’ and no less than three different handstruck ‘Not found’ markings as well as the Polish Naval Headquarters cachet.
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