The ANT dot over dot issue is not in RIC VI, but several other sources including Voetter list it. There were nine examples for Severus (#3981- 9) noted in King and Spaer "A Hoard of Folles from Northern Sinai", Numismatic Chronicle 1977; though none from workshop H. On a side note, this article was exactly why I got a copy of NC 1977, so it is nice to actually get to use it.
Several examples on Lech's page-
http://www.notinric.lechstepniewski.info/6ant-81_sev_h.htmlSeverus II
A.D. 307
26x28mm 10.2g
IMP C FL VAL SEVERVS P F AVG; laureate head right.
GENIO POPV-LI ROMANI; Genius stg. l., head towered, loins draped, r. holding patera, l. cornucopiae; H in right field.
In ex. ANT dot over dot
RIC VI Antioch --
