UNLISTED ISSUE. This type apparently belongs to the sub-group (vi), i.e. CYZICUS 108-110. The mintmark varies because there is no room for star in left field.
General note from p. 576: "This very small issue - the coins are all extremely rare - comprises only Herculi Victori, for Constantine, and Iovi Conservatori and Soli (sic) Invicto for Maximinus. Emissions for Licinius are not recorded. The highest officina number recorded is Z. Date, 313". Footnote 1 on p. 595 emphasizes that "Evidence for this isue is very poor, and the full number of officinae is uncertain". All coins listed in RIC are cited after Voetter and Sutherland probably has not seen them.
Coin should be listed in RIC after CYZICUS 110.
CYZICUS [after 110], CONSTANTINE, UNLISTED ISSUE [VIRTVTI EXERCITVS]