Pupienus (April-July 238 A.D.) -  AR Denarius - 21.17mm, 3.21g
Obverse - IMP C M CLOD PVPIENVS AVG Pupienus, his laureate, draped and cuirassed bust right.	Reverse - PAX PVBLICA Pax seated left, holding olive branch and scepter.
The image below was photographed by Paul-Francis Jacquier. The image above is my own scan.
Minted in Rome, April-June 238 A.D. Reference: Mattingley, Sydenham, & Sutherland, "Roman Imperial Coinage", Volume 4, Part 2 (RIC), p173, nr. 4. Carson, R.A.G., "Coins of the Roman Empire in the British Museum", Volume 6 (BMCRE), p254, nr. 47. Sear, D.R., "Roman Coins and their Values" (RCV Millennium Edition), Vol. 3, p107, nr. 8526. Sear, D.R., "Roman Coins and their Values" (RCV 4th Revised Edition), p232, nr. 2415. Cohen, H, "Descriptions Historique des Monnaies frappees sous l'Empire Romain" (C), Volume 4, p513?, nr 22. Seaby, H.A. & Sear, D.R., "Roman Silver Coins" (RSC), Volume 3, p160, nr. 22. Van Meter, D., "Handbook of Roman Imperial Coins" (VM), p223,  nr. 7. Suarez, R., "Encyclopedia of Roman Imperial Coins" (ERIC II),  p430, nr 14 (B1, O1, R08, T06) Suarez, R., "Encyclopedia of Roman Imperial Coins" (ERIC II-Digital),  p360, nr 14 (B1, O1, R08, T06) Kampmann, U., "Die Münzen der römischen Kaiserzeit", 2nd edition, (Kampmann) p276, nr. 71.7. Quality: Very Fine+/about Extra Fine Rarity: S (Scarce).