The history of the post office from its establishment down to 1836 (1893)
Joyce, Herbert · London, R. Bentley & Son · leaf 54
. As a check upon his messengers he supplied the seven sort¬ ing offices with stamps bearing their own initial letters and denoting the several hours of the day. With one of these stamps all letters and parcels were impressed as they passed through the post, and if in the busy parts of the capital… … This was the introduction of postmarks. In the first and last impressions Mor. 8 signifies of course 8 o’clock in the morning, and Af. 4, 4 o’clock in the afternoon. In the second or middle impression the initial letter L signifies Lyme Street, where the principal office of the penny post was held…
Postal service
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