This series consists primarily of 'proof books', that is bound volumes and files containing specimen impressions of new date, machine cancellation or other handstruck stamps (both steel and rubber) for postal use, authorisations and instructions for use, handstamp destruction records and historical summaries of machine cancellations.
These two main collections of proof books have substantial gaps, notably, for steel stamps, for the period after 1821, and, for rubber stamps, after 1831. It is believed that the proof books for these periods were lost in the major fire which occurred in 1957 at the Supplies Department, Mount Pleasant, where these records were once housed. Regrettably, when the surviving volumes in these two collections were rebound in c1960, the original volume numbers were lost, and new artificial numbering sequences were given to the newly-bound volumes. This destroyed the evidence once offered by the original bindings, making it impossible now to determine exactly what has been lost from the original series.
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