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Squared Circles - Experimental Cancellations

Posted: Wed Nov 07, 2007 6:00 pm
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.