The Penny postage jubilee and philatelic history (1891)
Phil · London, Sampson Low · leaf 179
On Post-ma rks 157 … 1802c 1840. 1825. ( Obliterating .) A duplex date- stamp has been in use since about the year 1860 in most of the head post-offices of the United Kingdom, but owing to its bulkiness is being gradually superseded by a single combination stamp. One portion of it obliterates the postage- stamp and…
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