Squared Circles - Experimental Cancellations

British postmarks of all kinds and eras.
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alexiosp
Posts: 45
Joined: Wed Nov 07, 2007 6:00 pm

Squared Circles - Experimental Cancellations

Post by alexiosp »

Hello, I am trying to find examples of the 3 experimental cancellations described as SD3, SD4, SD6 in the excellent Collecting British Squared Circle Postmarks (PART II - THE LONDON OFFICES) in pages 8-9. Should you have details of any such items, please drop a line! Thanks.
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