Under the tetrarchy and later there were some rare fractional denominations. This coin of Diocletian is only 14 mm.
Diocletian, AD 284-305
14 mm. 2.00 grams. The small "1/8 follis" denomination.
DIOCLETI-ANVS AVG, head right laureate
VOT/XX/AVGG in wreath
RIC VI Trier 610a.
Zschucke 4.2
Struck c. September 303 [RIC and Zschucke agree]
for the festival occasion celebrating vows for twenty years.
I just put up a web page on these fractional coins:
http://augustuscoins.com/ed/VOTA/fractions.htmlIf you read it and have anything to suggest, PM me.
If you have any of these small fractions from Diocletian through Constantine, show us!
