Here's a coin I added to my collection recently: an unlisted variant of a very rare "army type" denarius struck under Hadrian. HADRIAN, AD 117-138 AR Denarius (18.6mm, 3.00g, 6h) Struck AD 130-133. Rome mint Obverse: HADRIANVS AVG COS III P P, laureate bust of Hadrian right, with slight drapery on far shoulder Reverse: MAR-TI, Mars, helmeted, standing facing, head left, holding inverted spear in right hand and resting left hand on shield References: RIC II.3 1588 (R3) var. (A2 bust); RCV – ; ERIC – . Light toning, somewhat rough surfaces, flan flaw on obverse, good portrait. An unlisted bust variant of an extremely rare type, apparently known from a single obverse die. In my researches I was able to find only two other specimens, both from prominent collections. This type, with its martial theme and inscription to Mars, the god of war, is included in the rare group of "army type" denarii struck under Hadrian around the time of the Bar Kokhba Revolt.
Roman Republic Silver Denarius Serratus (minted in Rome in 70 BCE by Quintus Fufius Calenus and Publius Mucius Scaevola):
Umayyad Gold Dinar of al-Walid I (minted in Damascus sometime between 705 and 715): This isn't a new coin, rather the second historical coin I bought as an adult.
Not a rare coin, but a nice problem-free AE as of Titus as Augustus, with a good portrait: TITUS, AD 79-81 AE As (28.1mm, 10.91g, 7h) Struck AD 80-81. Rome mint Obverse: IMP T CAES VESP AVG P M TR P COS VIII, laureate head of Titus left Reverse: AEQVITAS AVGVST, Aequitas, draped, standing left, holding scales in right hand and rod in left; S C across fields References: RIC II.1 215; RCV – ; ERIC II 360 Dark patina, excellent centering and strike. Some deposits. A stately portrait of Titus as Augustus. Aequitas was the Roman personification of equality, fairness, and justice, and is often depicted on Imperial coinage holding a balance scale.
Seleukid Silver Tetradrachm of Antiochos VIII Epiphanes (minted in Damaskos either in 115 or 114 BCE):