Ancient Roman Key Ring circa 1st to 3rd Century AD

Caligula Magistrates, Gaius Calpurnius Aviola, proconsul and Menopahanes Size: 15.6mm Weight: 3.2 grams Obverse: ΓΑΙΟΝ ΚΑΙϹΑΡΑ ΕΠΙ ΑΟΥΟΛΑ. Laureate head of Caligula, right Reverse: ΖΜΥΡΝΑΙΩΝ ΜΗΝΟΦΑΝΗϹ. Nike advancing right, holding palm and wreath Reference: RPC 2473; Klose XXVII A 

Augustus Size: 20.3mm Weight: 5.4 grams Bronze Æ Obverse: Bare head of Augustus, rightReverse: ϹΕΒΑϹΤΟϹ ΚΙΒΥΡΑΤΩΝ; capricorn, right, head turned backReference: RPC Online, 2882

Roman Emperor Claudius I Weight: 4.1 grams Size: 15.8 mm Obverse: KΛAVΔIOC KAICAP, laureate head right Reverse: ΚΑΔΟΗΝΩΝ ЄΠΙ / ΔΗΜΗΤΡΙΟΥ ΑΡΤЄΜΑ Zeus standing left, holding eagle and sceptre; monogram to left

Augustus with Livia Aristion, grammateus; Presbon, magistrate Size: 20.3mm Weight: 5.4 grams Bronze Æ Obverse: Jugate heads of Augustus, laureate, and Livia, draped, right Reverse: ΓΡΑΜΜΑ[ΤΕ]ΥΣ / ΑΡΙΣΤΙΩ[Ν] / EΦ[E] / MENT[Ω]N, Stag standing right; quiver above Reference: RPC I 2599 

Constantine I Minted in Alexandria, Egypt Size: 20mm Weight: 3.1 grams Obverse: CONSTANTINVS AVG Laureate, draped and cuirassed bust to right Reverse: PROVIDENTIAE AVGG, campgate with two turrets; 6 levels, star above; in exergue SMALB