The Pentassarion denomination
The pentassarion was a bronze denomination worth 5 asses - assarion in Greek.

It was commonly struck by Roman Provincial mints, and was not struck to a standard weight but rather to some local standard. It was simply a coin worth 5 of the local basic coin denomination.

The pentassarion was commonly marked with an E or epsilon on the revserse denoting '5'.
Pentassarion

(1) Caracalla | Julia Domna 198-217 AD
Obverse: ANTΩNINOC AVΓOVCTOC IOVΛIA ΔOMNA, laureate bust of Caracalla right, seen from front and draped bust of Julia Domna left, vis-à-vis .
Reverse: VΠA KVNTIΛIANOV MAPKIANOΠOΛITΩ-N, Tyche Soteiros (Fortuna Redux) standing left, holding rudder in outstretched right hand and cornucopiae in left; E in upper left field.
Ref: AMNG I 678 var. (VP); cf. Mouchmov ...
(2) Elagabalus | Julia Maesa 218-222 AD
Obverse: Confronted busts of Elagabalus right, laureate, and Julia Maesa left, draped
Reverse: Homonoia standing left, holding patera and cornucopia; E (mark of value) to right.
Ref: None provided
(3) Gallienus 253-268 AD
Obverse: laureate, draped and cuirassed bust right from behind, eagle below; AYT KAI ΠOYΛI EΓNA ΓAΛΛIHNOC CE / IA {E}
Reverse: Apollo Sidetes facing, head left, holding phiale and scepter; CIΔHTΩN__NEΩKOPΩN
Ref: SNG France 924; SNG von Aulock 4844
(4) Gordian III | Tranquillina 238-244 AD
Obverse: AVT K M ANT ΓOPDIANOC AVΓ CE TPANKVΛ-ΛEINA: Confronted busts of Gordian on left, laureate, draped and cuirassed, and Tranquillina on right, draped and wearing stephane
Reverse: OΔHCCЄITΩN: Nemesis standing left, holding wand over wheel, and sceptre.
Ref: AMNG I, 2394; SNG Copenhagen 687; V...
(5) Severus Alexander | Julia Maesa 225-226 AD
Obverse: laureate, draped and cuirassed bust of Severus Alexander right, confronting diademed and draped bust of Julia Maesa left; AVT K M AVP CEVH AΛEZANΔPOC IOVΛIA MAICA·
Reverse: Dikaiosyne (Aequitas) standing half left, holding scales and cornucopia; VΠ TIB IOVΛ ΦECTOV M(AP)KIANOΠOΛIT(ΩN) / E
Ref: Moushmov 727