Dulwich Mark - First trialed in 1894, the Dulwich type of double arc dated postmark became the standard British type for many years.
Dumb cancellation - An obliteration handstamp containing neither figure nor letter, often made of cork.
Dulwich mark: double arc dated postmark started in Britain in 1894, used for many years.
Dumbarton & Balloch Railway: Scotland local post.
Dumb cancellation: postmark that shows neither the date nor place of cancellation.
 See also: Packet, Packet letter, Arrow, Army post office, Adhesive
  
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