Registered Postmarks (GB)
From Stamps of the World
Whilst the agreed use of black for striking registered posts was clear, occasionally the wrong ink was used and you find strikes in colours often associated with other handstamp types.
2d Registered 1894-1921
Registered plus 2d Value postmarks appeared from the early 1890's. Their use continued into the 1920's. Only a few provincial towns throughout Great Britain have examples known, shown here. The cancel was stopped in 1921 when the registration fee was raised to 3d. Keep your eyes open for cancels with the 2d removed but the word registered not yet realigned. We do not have any examples of this yet but Allcock and Holland confirm their existence!