Diadumenianus (217-218 A.D.) - Silver Denarius - 19.81x19.29mm, 3.09g
Obverse - IMP OPEL ANT DIADVMENIAN CAES Diadumenian, his bareheaded and draped bust right.	Reverse - SPES PVBLICA Spes advancing left, holding flower and raising skirt.
The image below was photographed by Paul-Francis Jacquier - Numismatique antique. The image above is my own scan of the coin, using an A4 flatbed scanner.
Minted in Rome in March-May 218 A.D. Reference: Mattingly, H & Sydenham, E.A., "Roman Imperial Coinage", Volume 4, Part 2 (RIC), p14, nr. 116a. Mattingly, Carson & Hill, "Coins of the Roman Empire in the British Museum", Volume 5 (BMCRE), p510, nr. 94. Sear, D.R., "Roman Coins and their Values" (RCV Millennium Edition), Vol. 2, p594, nr. 7450. Sear, D.R., "Roman Coins and their Values" (RCV 4th Revised Edition), p210, nr. 2072. Cohen, H, "Descriptions Historique des Monnaies frappees sous l'Empire Romain" (C), Volume 4, p314, nr. 21. Seaby, H.A. & Sear, D.R., "Roman Silver Coins" (RSC), Volume 3, p108,  nr. 21. Van Meter, D., "Handbook of Roman Imperial Coins" (VM), p204, nr. 20/2. Suarez, R., "ERIC II - The Encyclopedia of Roman Imperial Coins" (ERIC II),  p373, nr. 69, (B3, O2, R05, T9) Suarez, R., "ERIC II - The Encyclopedia of Roman Imperial Coins" (ERIC II-digital),  p313, nr. 69, (B3, O2, R05, T9) Kampmann, U., "Die Münzen der Römischen Kaiserzeit", 2nd. revised edition (Kampmann), p247, nr.55.4. Quality: Very Fine+ Rarity: R (Rare)