ambr0zie

I am not qualified enough to provide a verdict about authenticity, but this type is one of the most forged from all Roman imperials. Including Paduan copies (these one have a numismatic value, but still copies). And of course modern ones. 

I remember I saw an auction with a forgery, listed as 'copy of Paduan'. A specialist would have no doubts, but for me it was very deceiving - corroded, toned and cleaned, whatever. 

The price for a genuine example is pretty high so the purchase price should be a good clue - if it was cheap this is a big suggestion. 

19,4 mm, 2,7 g.
Septimius Severus 193-211. AR denarius. Rome. 197.
L SEPT SEV PERT AVG IMP VIIII, laureate head right / MVNIFICENTIA AVG, elephant, cuirassed, advancing right.
RIC 100; BMCRE 168; RSC 349.

 Next - ANOTHER large animal 

Stag, but just standing 

18 mm, 3,86 g.
Ionia, Ephesos. Geta as Caesar 198-211. Ӕ. 209-211.
Λ CEΠ ΓETAC K, bare headed, draped and cuirassed bust right / EΦECIΩN, stag standing right.
Karwiese 553; SNG Cop 428 var.

22 mm, 3,19 g.
Philip I Arab 244-249. AR antoninianus. Rome. 248 AD.
IMP PHILIPPVS AVG, radiate, draped and cuirassed bust right / SAECVLARES AVGG / I, lion standing right. RIC 12; RSC 173.

Saecular Games/1000th Anniversary of Rome issue.

It is possible, but my assumption is that your coin is the L   I   E type. We cannot determin for sure how many dies were used, if your coin had an imperfect die because of wear or the engraver had a bad day. 

9 minutes ago, robinjojo said:

However I also see what you suggest, an Et to the right edge, obscured by a flan irregularity, typical for this type.  That would mean the LIE date was spread across the reverse, different from the more centralized placement of the full date in the lower center

Exactly - like examples 3, 4, 6 I mentioned. The E is on the right side. 

A coin from Alexandria I really wanted - initially I thought it is a very bad error from the engraver, doubling the first letter of Poppaea's name - but it's a die clash. Still a cool coin 

Extraordinary aureus. I don't have anything of the same level but I can surely understand the feeling of getting a major target. 

Just a few that I wanted a lot:

This design was only minted in year LIE (year 15) and I think your coin also fits. But the flan is small or chipped and the E is no longer visible, although the vertical bar and the upper horizontal bar are still there. 

https://rpc.ashmus.ox.ac.uk/coins/3/5768

Check examples 3,4 and 6.

For Alexandrian coins, it is not (very) unusual to have the year positioned in different ways on the reverse for the same type of coin. 

For example my Hadrian from year LIH is https://rpc.ashmus.ox.ac.uk/coins/3/5871

But as checked, this type is more often encountered as LIH in the left field, not LI-H as on mine, but it is not a separate entry in catalogues. 

37 mm, 26,1 g.
Cilicia, Tarsus. Maximinus I. 235-238 AD. Ӕ hexassarion. ΑΥΤ Κ Γ ΙΟΥ ΟΥΗ ΜΑΞΙΜƐΙΝΟϹ Π Π, radiate, draped, and cuirassed bust right, seen from rear / ΤΑΡϹΟΥ ΜΗΤΡΟΠΟ Α Μ Κ Γ Β, the three Graces standing facing with arms around each other, one head l., the others head r., each holding flower. RPC VI, 7113 (temporary); SNG Levante 1096, BMC 233–4.

Next - Maximinus Thrax

20,5 mm, 5,23 g.
Phrygia, Docimeum. Pseudo-autonomous. Æ. Time of the Antonines 138-193.
ΔΟΚΙΜΟС, laureate head of Dokimos right / ΔΟΚΙΜƐΩΝ, Asklepios standing facing, head l., holding serpent-staff.
RPC IV.2 online 8136 (temporary); SNG Copenhagen 354; BMC 7-9.

Next - Asklepois

3 bulls do the trick 

7 mm, 0,19 g.
Caria, uncertain mint. AR tetartemorion. Circa 500-400 BC.
Confronted bull heads / Forepart of bull right, within incuse square.
SNG Kayhan 969.

Next - tetartemorion 

Link - a coin of his son, with the same name and with a very similar reverse 

19 mm, 3,82 g.
L. Marcius Philippus. AR denarius. Rome. 57 BC.
ANCVS, diademed head of Ancus Marcius right; lituus behind / PHILIPPVS on left, equestrian statue standing right on top of aqueduct (five arches), inscribed AQVA MAR (last three letters ligate); flower below horse (or splash of water?).
Crawford 425/1; Sydenham 919; BMC 3890; RSC 28.

Great article, as usually. 

My relevant coins:

RIC III Antoninus Pius 384a

17 mm, 2,56 g.
Diva Faustina I. Died 140-141. AR denarius. Rome.
DIVA FAVSTINA, bust of Faustina I, draped, right, hair elaborately waved in several loops round head and drawn up and coiled on top / CONSECRATIO, peacock, walking right, head turned back left.
RIC III Antoninus Pius 384a (denarius); RSC 175; BMC 473.

23 mm, 8,70 g.
Kings of Thrace. Rhoemetalkes I and Pythodoris, with Augustus, 11 BC-12 AD. Ӕ. Unknown mint in Thrace.
ΒΑΣΙΛΕΩΣ ΡΟΙΜΗΤΑΛΚΟΥ, jugate heads of Rhoemetalces, diademed, and his queen Pythodoris, r. / ΚΑΙΣΑΡΟΣ ΣΕΒΑΣΤΟΥ, head of Augustus, r.
RPC I, 1711; Youroukova 204–8, pl. XXIV.

Next - Thracian provincial 

In order to identify it, the reverse is also needed and measurements would be useful. 

All I can say at this point is the character might be helmeted Ares, but nothing more (including an opinion about authenticity)

1 hour ago, Curtisimo said:

Here is mine:

 

When I wrote the first paragraph, I had your coin in mind.

25,5 mm, 11,22 g.
Egypt, Alexandria. Claudius 41-54. Æ diobol. Year 3 - 42-43.
ΤΙ ΚΛΑV ΚΑΙ ϹƐΒΑϹ ΓƐΡΜΑ, laureate head r.; star before / ΑVΤΟΚΡΑ, hippopotamus standing r.; L Γ (date) in exergue.
Köln 79; Dattari 166; Milne 90; Emmett 82; RPC I 5140.

Next - any Alexandrian bronze 

I have the 2 types mentioned by @Roman Collector, but here is my favorite Hadrian semis 

20 mm, 4,03 g.
Hadrian 117-138. Æ semis. Rome. Struck 124-125.
HADRIANVS AVGVSTUS, bust of Hadrian, laureate, draped and cuirassed, right, viewed from rear or side / COS III SC, Roma seated left on cuirass, resting foot on helmet, holding Victory and spear; behind, shield.
RIC II, Part 3 (second edition) Hadrian 760; RIC II Hadrian 685 (semis).

Trajan 

23 mm, 6,77 g.
Trajan 98-117 AD. Ӕ semis. Rome (possibly for circulation in Syria). 114-117 AD. IMP CAES NER TRAIAN OPTIM AVG GER DAC PARTHICO, radiate and draped bust of Trajan right / P M TR POT XX COS VI P P, S C within oak wreath.
RIC II Trajan 660.

A long time ago I saw a coin posted by a member and for more than one reason I immediately added this type on my wish list (and I would love to see it again in the thread, the owner will know what I'm talking about)

My example is on the humble side and also just a drachm, not a tetradrachm, but It's beautiful enough to tick this box. 

14 mm, 3,51 g.
Greek satraps of Caria, Halicarnassus. Maussolos. AR drachm. Circa 377/6-353/2 BC. Laureate head of Apollo facing slightly right / [M]AYΣΣΩΛ[ΛO], Zeus Labraundos standing right, holding sceptre (or spear) and labrys; behind, ME monogram.
SNG Copenhagen 593; SNG Kayhan I, 876..

Why did I want this type? Well, more than I reason. One can simply not resist an ancient duck face. I also like the pose of Zeus, holding the labrys (although I can't unsee that it looks pretty much like a guy preparing to cut down a tree) 

The main reason is the fact that this satrap remained in history for his tomb, one of the Seven Wonders of the ancient world. This was ordered by his wife and sister, Artemisia, for the memory of Maussolos. And the term "mausoleum" became today a noun meaning a large building hosting a town or a group of town. 

This is how the Mausoleum of Halicarnassus looked like

The Mausoleum of Augustus 

And another mausoleum, from the town I was born in, build to commemorate the heroes who died in one of the largest battles in WW1 

Please post anything you feel relevant: people from antiquity who left something important behind; ancient duck faces; weapons, anything. 

Biga again

17 mm, 3,36 g.
M. Volteius M. f. AR denarius. Rome. 75 BC.
Head of Bacchus (or Liber) right, wearing ivy wreath / Ceres driving biga of snakes right, holding torch in each hand; dolphin behind.
Crawford 385/3; Sydenham 776; Volteia 3.

25 mm, 12,71 g.
Egypt, Alexandria. Hadrian 117-138. Billon tetradrachm. 133-134 AD.
ΑΥΤ ΚΑΙϹ ΤΡΑΙΑΝ - ΑΔΡΙΑΝΟϹ ϹƐΒ, laureate draped and cuirassed bust of Hadrian, r., seen from rear / L ΙΗ, Sarapis seated, l., holding sceptre; to l., Cerberus.
RPC III, 5871; BMC 620-623.

Next - 2nd century Alexandria tetradrachm

Retrograde 

15,8 mm, 3,51 g.
L. Julius L.f. Caesar. AR denarius. Rome. 103 BC. CAESAR, helmeted head of Mars left, [S (retrograde) above] / [L IVLI L F], Venus driving biga of Cupids left, holding reins and sceptre; [lyre to left], S (retrograde) above. RSC Julia 4a; Crawford 320/1; BMC 1406; Syd. 593a.

The next theme was Chi-Rho requested by John. 

18,2 mm, 1,67 g.
Gratianus 367-383 AD. Ӕ follis. Siscia. 367-375.
DN GRATIANVS PF AVG, pearl-diademed, draped and cuirassed bust right / GLORIA ROMANORVM, emperor in military dress walking right, head left, holding labarum, dragging a kneeling captive by the hair, F to left, R above hooked A (symbol 4) to right. Mintmark ΔSISCVE.
RIC IX Siscia 14c type xxxvii var.

Next - to keep it flowing - 

19 mm, 2,06 g .
Constans 337-350. Æ follis. Siscia. 348-350.
D N CONSTA-NS P F AVG, bust of Constans, pearl-diademed, draped, cuirassed, right / FEL•TEMP•REPARATIO, Phoenix, radiate, standing right on rocky mound. Mintmark ΓSIS•.
RIC VIII Siscia 232.

Next - Constans

15,1 mm, 3,58 g.
L. Plautius Plancus. AR denarius. Rome. 47 BC.
[L · PLAVTIVS] below, head of Medusa facing, with coiled snake on either side / PLAN[CV] (or PLANCVS), Victory (or Aurora) flying right, head slightly left, holding reins and conducting four rearing horses of the sun.
Crawford 453/1a or 1b (PLANCVS/PLANCV); BMC 4004/4008; Sydenham 959/959a; Plautia 15/15a; RBW 1583-4.

6 hours ago, John Conduitt said:

My first gold. I actually decided not to collect gold, but sometimes it's all that's available.

Magnus Maximus Solidus, 383-388

Augusta/London. Gold, 21mm, 4.59g, 6h. Rosette-diademed, draped and cuirassed bust of Magnus Maximus right, seen from front; D N MAG MA-XIMVS P F AVG. Magnus Maximus and Theodosius I seated facing on double throne, jointly holding globe between them; half-length figure of Victory above facing between, vertical palm branch under throne; VICTOR-IA AVGG; AVGOB in exergue (RIC IX, 2b; Biaggi 2312 (this coin)). Ex Leo Biaggi de Blasys. NGC #6057866-002. A double die match for this coin in the British Museum.

If you decided not to collect gold, this coin doesn't fit your collection. I can accept it as a friendly gesture, without any extra cost from your side as I am a decent person.