Just Testing: Identification Of These Four Coins

I'll get the ball rolling. My advice to that VCoins dealer: don't always assume they're Roman.

I suspect the upper left coin may of the Vandals, possibly Hilderic. For similar see Noob's thread here: https://goccf.com/t/138934

Lower left looks Byzantine with that large Chi Rho reverse. Echizento is the expert on these here, but the Greek gamma in the reverse left field suggests 3rd officina on a Justinian I pentanummium to me. For similar see:
http://coinproject.com/coin_detail.php?coin=223194

And another: http://www.ebay.co.uk/itm/BYZANTINE...381333107324

1 I would wager is Arcadius or Honorius, CONCORDIA AVG cross type:

http://www.tesorillo.com/aes/010/010i.htm

These are one of my favorite types, because there are some insane rarities hiding out there, and most don't even bother trying to attribute them.

2 needs some cleaning, at least to bring out the legend.

3 I agree is Byzantine.

4 isn't imperial Roman. No official AE4 has two busts, and the provincial issues were rarely that small. The bust style in the first pic looks either Vandalic, or maybe even Celtic... I know spain issued some odd looking tiny bronzes that remained in circulation for centuries.