For the 1871 half penny there are two
. The differences can be noted in the date.
1871 Half Penny
The spacing between the eight and the seven is 0.61 mm.
The seven is centered over a denticle.
The spacing between the eight and the seven is 0.74 mm.
The seven is to the right of the denticle.
There is only one die.
For more close up images of this coin,
under the microscope page.
The spacing is measured between the eight and the seven.
Obverse Dies: The Date
Part Three: Thirteen Pence to a Shilling - Queen Victoria Bronze Issues