Here is another example which clearly shows that Constantine is holding something. Maybe only a mappa, but it looks more like a pommel. This coin is not listed in RIC for the H11 bust, though I have had several and the Bikic-Do hoard had several also.
Constantine I
A.D. 319
20x21mm 3.5g
IMP CONSTAN-TINVS AVG; high crested helmet and cuirassed bust left, spear across right shoulder.
VICTORIAE LAETAE PRINC PERP; two Victories stg., facing one another, together holding shield[wreath] inscribed VOT PR on altar.
in ex. BSIS•
RIC VII Siscia --