First one: a nummus, with the personification of the Roman people on the obverse and a bridge (possibly the milvian bridge) on the reverse.
Second one: an antoninianus of emperor Valerianus I, with restitutor orbis on the reverse.
Third one: a badly pitted didrachm from Gela, I think. There seems to be no legible legend, or maybe it always was anepigraphous. I bought it for 10€ in the end.
The first coin is an "eyes to heaven" siliqua of emperor Constantine I, Siscia mint.
In the second photo, a denarius of emperor Vitellius, XV vir sacris faciundis, with a dolphin over the tripod, and a tiny half quadrans of emperor Trajan, minted for circulation in Syria.
Sorry for the bad photos, my phone's camera isn't great.
The Italian coin weighs 9g with 83,5% purity; paid 8€. I was lucky enough to see that there was a 1964 half amongst the 40% silver ones, and got it for 17€; I bought both the dimes for 5€.
In total I bought 23,265g of fine silver for 35$/30€.
I was browsing VCoins yesterday and I came across an antoninianus of Gallienus. The seller in the description wrote that in MIR only six such coins were known. I've not been able to find that information anywhere.
Bought this 5 kopek coin this morning for very cheap. Once I got home I noticed some green spots on it, a very big one being near the eagle's head. It wasn't very powdery though.
It's worth mentioning that as far as I know the coin spent a long time in a PVC flip, and the region I live in is very humid.
Latest addition to my collection. Really high grade with a nice patina.
There is a small lamination on the obverse, which is why I was able to get it for somewhat cheap I think.