Constans, AR Siliqua, 20 mm, 3.59 gr. 337-340 AD, Siscia. 

FL IVL CONSTANS P F AVG, rosette-diademed, draped, cuirassed bust right.
CONSTANS AVG, three palm branches upright, eight-rayed star above.

Mintmark dot SIS dot-in-wreath. 

RIC 69. RSC 1+a.

Rated R3.

Contributed by Dr. Hubert Lanz, auction November 2000, 
Added July 2011.