Impressive work there, fairdinkumstamps.

Quote:
The last stamp in the
First picture above "Hamilton " caught my attention
Not sure what the "C" is about
Can anyone explain
Thanks
That is an hammer identification device.
Imagine a Post Office with say a counter with 3 clerks,
each with their own hammer. a b, c etc
This is a great way to keep a check on cancelling devices,
in the event of theft, misuse etc.
Most are kept in safes during times of non requirement.
When hammers are sent away for repair, Hammers with "Relief" are issued.