Burnett Allectus (Burnett Coinage)

Burnett, A. "The Coinage of Allectus: Chronology and Interpretation" in BNJ 54 (1984), pp. 21 - 40.

Available online: http://www.britnumsoc.org/publications/Digital%20BNJ/pdfs/1984_BNJ_54_5.pdf

The following bust abbreviations are used.
Gold Aurei
BI: cuirassed.
D1: draped, seen from front.
D2: draped, seen from rear.

Billon
Bust varieties:
B1: radiate, cuirassed, right (=F in RIC).
D1: radiate, draped and cuirassed, right, seen from front (=C in RIC).
D2: radiate, draped, right, seen from behind (=A in RIC).
consular: radiate, wearing trabea, left, and holding eagle-tipped scepter.
trabea: radiate, wearing trabea, left.
spear and shield: radiate, cuirassed, left, holding spear over shoulder and shield.