Earlier today (about 12 hours ago), I bought a few ancient coins (from a guy who was so good in selling them that he got me to buy much more than I wanted).
Approximately, you can think I paid $10 per coin (this is not the actual breakdown, but it results in a sum very close to reality, and the actual figures would've been far too confusing). Coin #1 is late Roman, rest are (probably) Greek.
Note: some of these might be far more common in my country than in UK/USA. Not that I care

What I was told I bought:
1. Arcadius/Salus small copper (supposedly fairly decent as these issues go)
2. Panticapeus chalkos, 4th century BC
3. Seleucid Antiocheia aurichalkos, 3rd century BC
4. Olbia dolphin, 7th/5th century BC (former date told by the guy I bought it from, latter by another guy I showed it to)
What I think I actually bought (after some googling):
1. Arcadius/Salus AE4?, probably Constantinople mint
2. Panticapeus tetrachalkos, circa 210 BC (Anokhin 145)
3. no idea really (apparently there's no such thing as a Greek aurichalkos)
4. Olbia dolphin, circa late 5th century BC
What they look like (to me anyway):
1. [...]ARCADIV[S?...], portrait in middle/SALVS REI[...], CO[...] in exergue; 14x12mm
2. Bow and arrow, ПANTI below/bearded head right; 16mm (and thick)
3. Figure sitting on chair holding scepter? behind, lots of fancy Greek script (see note) on sides/bearded head [Zeus?] right; 18mm (and almost as thick as #2) - oh and it's also yellow(ish)
4. Vaguely dolphin-shaped flat piece of copper, linear-ish protrusion along one side; 30x9(?)mm
Note: I can kind-of read TIOXE on right of figure and TPOПOЛE on left; there are several other letters I can't reliably read, and several dots I can't assign to any letters
...Hope you might be of any assistance

(also in identifying #3). If you wonder, no, I haven't taken any photos and/or weighings (not yet anyway).