This is a revivial of Type 39, issued earlier from AD 388-403.
RIC X, 1912-1923, all of Rome, 6 varieties for T2 (3,R,3,4,4,4) (1 photo), 6 for Johannes (3,S,3,2,4,3) (3 photos).
Cayon J-7 (1 photo, mm off), T2--.
Johannes reigned 20 November 423 to May 425.
This type was issued at Rome which was in control of Johannes. It has a
distinct
crude style.