Bobby is on the money,
It is part of a hand held cancelling hammer, called a "duplex", meaning 2 parts.
The Left hand side is the CDS (Circular date stamp) and the right hand side is called the "Killer" (It cancels the stamp.)
Your "Victoria" is the killer.
It can be a number, bars, letters etc.
Duplex cancel
Posted 01/01/2019 1:39 pm
