Almost certainly an inspector's mark, applied because the item had gone through the system without obtaining a normal cancellation, either hand or machine stamp, and noticed by a postal inspector.
Value perhaps slightly above that with a normal cancellation, there are collectors who collect inspectors marks from the various post offices.
Almost certainly an inspector's mark, applied because the item had gone through the system without obtaining a normal cancellation, either hand or machine stamp, and noticed by a postal inspector.
Value perhaps slightly above that with a normal cancellation, there are collectors who collect inspectors marks from the various post offices.
No problem, your task now is to work out from the lettering in the mark, which office it originated from! It looks like SW, albeit inverted, which, I would guess, is a London SW mark. Often the letters conform to the lettering on the telegraphic code for the same office.
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