Dear Posters: 'A' has been easy but I believe there are a few letters that may give more trouble since the native languages of most of our coins did not use 26 letters in the alphabet. I suspect a few people will get used for more than one letter. Start thinking now about what you want to do for I/J and a few others.
ANTONIUS PIVS 1. AE Sestertius from Rome OBV: DIVVS ANTONINVS, bare head right REV: CONSECRATIO, four tiered funeral pyre surmounted by Antoninus in a quadriga, SC in ex. Struck 161 AD 25g, 31mm RIC 1266 (Marcus Aurelius) 2. AR Denarius from Rome OBV: ANTONINVS AVG PIVS P P IMP II, laureate head right REV: TR POT XIX COS IIII, Annona standing left with corn ears & modius set on prow Struck 155-6 AD 3.1g, 17mm RIC 249 3. AE 25 from Laodikeia ad Mare OBV: AVTO KAI TI AIL ADRI ANTWNINOC CEEBV, laureate head right REV: IOVLIEWN TWN KAI LAODIKEWN, turreted and draped bust of Tyche right; QE-HP P in fields Struck 140-1 AD 9.28g, 25mm SNG Copenhagen 350 var, BMC 57
Aureolus Antoninianus from Mediolanum OBV: IMP POSTVMVS AVG, radiate, draped, and cuirassed bust of Postumus right REV: VIRTVS EQVIT, Virtus advancing right, holding transverse spear and shield; T in ex. Struck 268 AD 3.17g, 19mm RIC V 388
Edit to my prior post: That Alexander III drachm was minted under Antigonos I Monophthalamos, 320-319 BC, so it's a two-fer.
Man, I got stuck on "B"!!! (*sigh) ... B, I, Q, R, U, W, X, Y, Z are all difficult for me ... maybe I'm just being blind? => actually, "J" shouldn't be too difficult once I get into my Roman rulers
Aurelian 1. Antoninianus from Serdica OBV: IMP AVRELIANVS AVG, radiate cuirassed bust right REV: ORIENS AVG, Sol standing left with hand raised, foot on one of two bound captives, XXIP in ex. Struck 274 AD 3.4g, 23mm RIC 63f 2. Antoninianus from Mediolanum OBV: IMP AVRELIANVS AVG, radiate cuirassed bust right REV: FORTVNA REDVX, Fortuna seated left on wheel, holding rudder & cornucopiae, T in ex. Struck 274-5 AD 3.30 g, 20 mm RIC 128 3. Antoninianus from Antioch OBV: IMP C AVRELIANVS AVG, radiate bust right REV: RESTITVT ORBIS, female on the left presents a wreath to Aurelian, holding a sceptre, Gamma in ex. Struck 270-5 AD 3.6g, 22mm RIC V 386 4. Tetradrahm from Alexandria, Egypt OBV: AUT K L D AURHLIANOC CEB, laureate, draped and cuirassed bust right REV: Eagle standing left on thunderbolt, wreath in beak, D/L (year 4) left, star right Struck 29 Aug 272 - 28 Aug 273 A.D. 7.73g, 21mm Dattari (Savio) 5470-1
Allectus 1. AE Antoninianus from Londinium OBV: IMP C ALLECTVS PF AVG - Radiate, draped and cuirassed bust right REV: SALVS AVG, Salus standing right, feeding serpent held in arms Struck 293-6 AD 2.4g, 20mm RIC V 42 2. AE Antoninianus from Camulodunum OBV: IMP C ALLECTVS P F AVG, radiate, cuirassed bust right REV: VIRTVS AVG, galley rowing left, QC in ex. Struck 293-6 AD 1.2g, 16mm RIC V 128
Oh yeah, I forgot about prutot. They're not fabulous examples but I like 'em anyway. Coponius prutah, CE 6/7, Judaean procurator under Augustus Marcus Ambibulus prutah, CE 8/9, Judaean procurator under Augustus
Anastasius (the last Roman pre-reform): Abhimanyugupta of Kashmir: Ardashir (Sasanian): ...and my final offering is that prolific producer of just about everything: Anonymous (pagan of Antioch from officina A with reverse Apollo c.310 AD)