Fausta, daughter of Maximian,
2nd wife of Constantine I,
mother of Constantine II, Constans and Constantius I
 (born ca. 289 A.D. - died 326 A.D.)
-  AE3 Billon Centenionalis - 19.60mm, 2.12g
Obverse - FLAV MAX-FAVSTA AVG
Fausta, her bare-headed draped bust right.
Reverse - SPES REIP-VBLICAE
PTR dot within Crescent  in Exergue
Fausta standing facing, head left, holding two children
(Constantius II and Constans) in her arms. 
Minted at the 1st officina (P)  in Treveri (Trier, Germany) in 326 A.D.

Reference:
Bruun, P.M., "Roman Imperial Coinage", Volume 7 (RIC), Trier, p209, nr 484.
Failmezger, V., "Roman Bronze Coins From Paganism To Christianity 294-364 A.D." (Fm), nr 357H
Carson, R.A.G., Hill, P.V., & Kent, J.P.C., "Late Roman Bronze Coinage" (LRBC), Part I, p28?, nr 36.
Sear, D.R., "Roman Coins and their Values" (Sear RCV 4th Revised Ed.), p329?, nr. 3908, var with SMKA dot mint mark.
Sear, D.R., "Roman Coins and their Values" (Sear RCV Millennium Ed.), Volume 4, p510, nr 16560
Suarez, R., "Encyclopedia of Roman Imperial Coins II" (ERIC2),  p887, nr.47 (B1, O1, R3, T3, M5, SMKAdot)
Suarez, R., "Encyclopedia of Roman Imperial Coins II" (ERIC II-digital), p??, nr.47 (B1, O1, R3, T3, M5, SMKAdot)
Cohen 17
Van Meter, D., "Handbook of Roman Imperial Coins" (VM), p293, nr 3, reverse legend variety
Kampmann, U., "Die Münzen der römischen Kaiserzeit" (K, 2e Auflage), p426, nr. 139.4.

Quality: Very Fine
Rarity:  C (Common)