Triangular "O MTP" 1940 machine cancellation
This free mail letter postmarked FPO 45 on 9 June is a very late example of RAF mail from France in 1940. However I have not seen the triangular "O MTP" machine cancellation before and not been able to find any information about it. If anyone on this forum could tell me anything about it I would be most grateful.
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Attached a later example which might be of interest