It was struck only infrequently, mostly in the years the Diocletian coin reform in 294 AD and before the shrinking follis made the half-follis impractical.
When the Follis was reintroduced by Anastasius in 498, the half-follis was also reintroduced. It was valued at 20 nummi and marked with a large 'K' for 20.
Reverse: emperor seated left on curule chair, holding short scepter, raising right hand; REQVIES OPTIM_ORVM MERITORVM / •TS•A•
Die Orientation: -
Weight: 1.2 g
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Reverse: Constantine driving galloping quadriga heavenward, holding reins with left hand and raising right hand upwards to grasp Manus Dei, which reaches down from above; star in upper left field, SMANE in exergue
Die Orientation: 5 H
Weight: 1.73 g
Reverse: Emperor seated left on curule chair, holding short scepter, raising right hand; REQVIES OPTIM_ORVM MERITORVM / SIS
Die Orientation: -
Weight: 1.16 g
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Reverse: AETERNAE MEMORIAE, Domed shrine with one door open, eagle standing facing right on roof; MOSTP in exergue
Die Orientation: 6 H
Weight: 3.82 g