Post Office Number Cancellations of Great Britain and Ireland
Number cancellations were used in Great Britain and Ireland based on numbers allotted to Post Offices in England and Wales outside London and Post Offices abroad. The cancellations were of different types.
No 75 – Birmingham PO (1844-1962)Horizontal Oval Duplex Cancellation – Dated 31 Oct 1872. Cancellation on Queen Victoria half Penny Postcard posted from Birmingham to Oxford.
Stamp Digest 