For the 1894 half penny there are two die varieties consisting of two obverse dies paired with two reverse dies.  Differences are easily located by checking for the alignment of the letter T in BRITANNIAR.  For the reverse dies there is a difference in the spacing in the date.


1894
Half Penny
Obverse
Reverse


The spacing is measured between the nine and the four.


Obverse Dies:  BRITANNIAR


Well aligned BRITANNIAR
Repunched first I;
Slightly rasied T


Misaligned BRITANNIAR
Low T


Reverse Dies:  The Date

Large Spacing

Small Spacing
Reverse Dies:
The Date

Wide 94

Narrow 94