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Examining examples of the Type 12A-1 and 12A-2 canceller on cover, it is apparent that both types were in use until the introduction of Type 12A-3, and in some cases overlapped with Type 12A-3 use.
The earliest examples I have seen of Type 12A-2 are on covers dated 6 May 1935 the First Day for the Silver Jubilee stamps. However, its use went beyond this date. The use of Type 12A-2 before 6 May 1935 is probably unknown.
MJ ‘6 May 1935 Silver Jubilee’ forged covers addressed to a London stamp shop are known but it has been impossible to find an example for this article.
Differences between forged and genuine cancellations of 6 May 1935.
Fig 5 Forged cancellations of Madam Joseph (Type 12A)
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