Revised Gibbons numbers for Security Machins (U-series)

As earlier advised, Stanley Gibbons have revised numbering of the U-series of Machin definitives which will be published in the 2018 edition of their Great Britain Concise catalogue.

Collectors who use their Windsor catalogue have already received the latest supplement which includes this table of changes.   My thanks to a couple of collectors who have sent me this, and to SG who have already sent me a slightly less organised table.  (Click on the table to see an enlargement.)

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