A bit bigger than my hand. Front has remains of a more ornate (gold?) surface. There are two patent dates, from 1865 & 1871 or 2.
On the back is a lever/metal arm and two small plates with metal 'teeth' between them. When you turn the round handle at the front, the two plates do down, squeeze together, then come up, at which point the metal arm sweeps under them.
In action, also this one and this one.
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