Cool idea and a great way to display your collection!

Spear

An old saying, "There is nothing more common than a rare ancient coin."

Here is a Pius and Verus from Cyrrhus.

I recently acquired a coin with similar reverse from Coropissus in Cilicia. I did not find a match but might be a place to look. Could also be Commodus.

ACSearch example. https://www.acsearch.info/search.html?id=12032462

*Just one specimen recorded by RPC, never recorded by acsearch*
Cilicia, Coropissus AE (Bronze, 14.51g, 27mm) Marcus Aurelius (161-180) for Lucius Verus (Augustus) Issue: Marcus and Verus, co-emperors (161–169)
Obv: ΑΥΤΟKPA ΚΑΙ ΛΟΥ ΑΥΡΗ OYHPOC; laureate head of Lucius Verus with traces of drapery, right
Rev: ΚΟΡΟΠΙϹϹΕωΝ ΚΗΤ[ωΝ Μ]...; Zeus standing, left, holding patera over eagle and long sceptre
Ref: RPC IV.3 №: 10239 (temporary) var. (reverse legend)

How about a real dragon tooth?

4" Spinosaurus Tooth

Spinosaurus (meaning "spine lizard") is a genus of theropod dinosaur which lived in what is now North Africa, from the lower Albian to Cenomanian stages of the Cretaceous period, about 106 to 93.5 million years ago. This genus was first known from Egyptian remains discovered in the 1910s and described by German paleontologist Ernst Stromer. These original remains were destroyed in World War II, but additional skull material has come to light in recent years. It is unclear whether one or two species are represented in the described fossils. The best known species is S. aegyptiacus from Egypt, although a potential second species, S. maroccanus, has been recovered from Morocco. Spinosaurus is often postulated as a piscivore, and work using oxygen isotope ratios in tooth enamel suggests that it was semiaquatic, living both on land and in water like a modern crocodilian.

I haven't considered my early roman coins from Thessaly to be Achaean. I need to.  Here are a few I can add.

Thessaly, Koinon of Thessaly under Augustus. Pseudo-autonomous AE15. Strategos: Megalokles

Strategos: Megalokles.
Obv. Head of Zeus, THESSALO
Rev. Head of Apollo, MEGALOKLEKLEI
RPC I, 1429A

Thessaly, Koinon of Thessaly. Augustus. 27 BC-AD 14. AE20. 

AE20, 9.0gm. Sosandrou Sosandros , magistrate.
Bare head right / Athena standing left, holding Nike and resting hand on shield; spear resting against her arm; monogram in left field. RPC 1425 var.

Thessaly, Koinon of Thessaly. Pseudo-Autonomous AE22. Eirene/Nike

Obv: EIPHNH ΣEBAΣTH ΘEΣΣAΛΩN, draped bust of Eirene right, wearing wreath of grain ears and olive branch.
Rev: ΛAOVXO-V C-TPA-THΓOV, Nike standing left on globe, holding wreath in extended left hand, cradling palm frond in right arm.
Laouchos, strategos.
Burrer Em. 2 (of Nero), Series 6, Grp. 1, 100 (A37/R69); RPC 1451.
Time of Nero. AD 54-68. Æ Diassarion

Silly hat.

Thrace, Lysimachia. AE10. Hermes with petasos.

Obv: Hermes bust with petasos.
Rev: LU / SI in a wreath.
SNG Cop. 922. Lindgren I, 39, 875
Rare.

Next: Hermes bust.

Great write-up Curtis and that coin is sweet! 

This one needs new photos as I cropped the edges to close. (20 yrs ago)

Ionia, Island of Samos. Marcus Aurelius Æ32. Samian Hera

Ionia, Samos. Marcus Aurelius. AD 161-180. Æ32. 13.7g.
Obv: Laureate, draped, and cuirassed bust right, seen from behind.
Rev: CAMI WN. Cult figure of Samian Hera standing facing on wide base between two peacocks.
SNG Copenhagen 1735.

And one of those coins you wish you had never sold...

Ionia, Island of Samos. Geta Æ19

ISLANDS off IONIA, Samos. Geta. As Caesar, AD 198-209. Æ19.
Obv: Bare-headed and draped bust right
Rev: Cult statue of Samian Hera facing between two peacocks.
SNG Copenhagen -; SNG von Aulock 2309 (same dies); BMC 266.

Any coin with Vespasian is a cool one David!

Philip I and an autonomous.

Phrygia, Cotiaeum. Philip I AE26 Kyble. C. Julius Ponticus, Archiereus

Phrigia, Cotiaeum. Between 244 and 249
Obverse. M IOYLIOS P'ILIPPOS AYG
Reverse. EPI G IOYL PONTIKOY ARC'IER EWS KOTIAEWN
Kyble on stool being pulled by biga of lions. Polos / Tympanon
SNG AUL 3787(1). BMC 17 S174,78(2)

Phrygia, Cotiaeum. Magistrate Diogenes, son of Dionysios AE24. AD 253-268.

Obv: ΔHMOC KOTIAEΩN, unbearded, diademed, draped bust of Demos right.
Rev: EΠI ΔIOΓENOY-ΔIONYCIOY, AΡ-C (in field right), KOTIAEΩN below, Zeus Aetophorus seated left, holding eagle and sceptre.

That's a nice Sicyon @Marsyas Mike!  I have one that is barely legible but it is a hard type to acquire.

Achaea. Sicyonia, Sicyon. Septimius Severus AE24

2 Assaria (AE, 5.3 g, 24 mm), c. 198-205.
Obv: Laureate head of Septimius Severus to right.
Rev: Dionysos standing left with kantharos and thyrsus.
Uncertain C/M

A few Achaean from Athens.

Achaea. Attica, Athens. AE18. Athena/Sphinx

Obv: Helmeted head of Athena Parthenos, r.
Rev: ΑΘΕ, sphinx wearing modius, r.; all in wreath.
Reign of Augustus, c. mid-late 20s BC.
RPC 1311.

Achaea. Attica, Athens. AE22

Obv: Bust of Athena r. wearing crested Corinthian helmet and aegis.
Rev: AΘH NA IΩN Bucranium bound by wreath.
Time of Hadrian and the Antonines.
BMC 810.

Achaea. Attica, Athens. AE22

Obv: Draped bust of Athena right, wearing crested Corinthian helmet.
Rev: AΘHNAIΩN, Athena standing facing, head left, holding spear in right hand and shield in left.
Kroll 318

Achaea. Attica, Athens. AE22. Triptolemos

Obv: Bust of Athena l. wearing crested Corinthian helmet and aegis.
Rev: AΘH NA IΩN / Triptolemos standing in biga drawn by winged serpents, l.
Time of Hadrian and the Antonines.
22mm., 6.1g.

Thank you for the informative post @Curtis JJ! The Taurokathapsia scene is amazing! If you are interested in ancient city locations here is a link to The Project Gutenberg eBook of The Atlas of Ancient and Classical Geography.  https://www.gutenberg.org/cache/epub/17124/pg17124-images.html. The Butler atlas is one of the most comprehensive for ancient cities from this period. 

Here is a Nero and a few from the Thessalian League.

Corinthia, Corinth. Nero. 54-68 AD. Æ 20mm . Ti. Claudius Anaxilaus and P. Ventidius Fronto, Duovirs. Struck 67-68 AD. Laureate head of Nero left / Nero stands facing within tetrastyle temple. BCD Corinth 480. SNG Copenhagen 235-236. RPC I 1208.

THESSALY, Koinon of Thessaly. Hadrian. AD 117-138. Æ Diassarion (20mm, 5.80 g, 6h). Nikomachos, strategos. AΔPIANON KAICAPA ΘЄCCAΛOI, laureate bust right, wearing drapery on far shoulder / (CTPA monogram) O (YX) NIKO-MAXOY, Athena Itonia striding right, hurling spear held in her right hand, shield on her left arm.

Thessaly, Koinon of. Septimius Severus AE21.

Obv: AVT L CEP CEBHPOCP, laureate head right.
Rev: KOINON QECCALWN, Athena Itonia standing right brandishing javelin & shield.

Should load now. Thank you Seth. I like your coin from Phigalia which was also called Phialia. Here's one with a Dionysus reverse.

Achaea. Arcadia, Phialia (Phigaleia). Septimius Severus Æ22

Obv: laureate head right.
Rev: ΦIAΛEΩN, Dionysos wearing short chiton, standing left, holding kantharos and thyrsos.
BCD 1644-1645; Pausanias 3.

Achaea was a province of the Roman empire consisting of the Peloponnese, Attica, Boeotia, Euboea, the Cyclades and parts of Phthiotis, Aetolia and Phocis. 

It is sometimes confused with the region of Achaea in northern Peloponnesos.

Here are a few favorites that I have re-photographed and added a background location map.

Hekate

My first impression was a lion skin. The Satraps of Lycia coinage has a lion mask.

Thrace, Serdica. Marcus Aurelius AE20. Bust of Isis

Obv: AY KAI M AYPH ANTΩNINOC Head facing r.
Rev: CEPΔWN Bust of Isis decorated with lotus r.

Link: Taras

Amazing coin! And 32mm? 

link: Olba

Cilicia, Olba. Æ15. Dated year 2 = AD 11-12.

Obv: Ajax, son of Teucer, high priest and toparch. Head of Ajax as Hermes, wearing close-fitting cap right.
Reign: Augustus. Magistrate: Ajax (high priest and toparch)
Rev: ΑΙΑΝ-ΤΟΣE ΤΕY-B-ΚΡΟY.
SNG Levante 633

Facing

Might be one of the worst condition coins in my collection but this Artemis facing portrait IMHO is one of the nicest representations of facing on a provincial bronze.

Caria, Bargylia. Augustus Æ20.

Obv: Bare head of Augustus (?), r.
Rev: ΒΑΡΓΥΛΙΗΤΩΝ; veiled facing bust of Artemis Kindyas.
RPC I, 2719.

RPC's example:

Can't say these are unique but I have not found other examples.

Achaea. Arcadia, Tegea. Caracalla Æ22

Obv: Laureate, draped and cuirassed bust of Caracalla to right.
Rev: TEGE ATΩN, Pan standing left, on goat legs, holding syrinx and lagobolon.

Achaea. Elis, Elis. Septimius Severus AE18.
Obv. - ΛCEPCEBHP.. Septimius Severus laureate, head rt.
Rev. - HΛEIWΝ Zeus standing rt. holding eagle in left hand and throwing lightning bolt with rt.

Bithynia, Nicomedia. Severus Alexander AE16. Galley

Obv: Laureate bust right.
Rev: ΝΙΚΟΜΗΔƐΩΝ ΔΙϹ ΝƐΩΚΟΡΩΝ, Galley with oarsmen above waves r.

.

Syria, Seleukis & Pieria, Gabala. Caracalla Æ27

Obv: AVT K M A ANTΩNINOC / Laureate bust of Emperor Caracalla right.
Rev: ΓABAΛEWN / Zeus seated left holding Tyche with cornucopia and rudder.

Uncertain Empress AE16

Obv: Empress facing r.
Rev: Athena standing r. holding spear in l. and resting r. hand on grounded shield.