Multiple coins to identify [opgelost]

First coin, 2.1 cm across 0.15 cm thick 

2nd coin 2.1 cm across 0.1cm thick

3rd coin 0.20cm thick silver?

For the third, you can measure the diameter. It's a french royal coin.

NAV on obverse, DOMINI on reverse

For the second one, a roman coin of the emperor Tetricus (Gallic Empire)

Might also be his son and caesar, Tetricus II

Our catalogue has a relatively good overview of their coins, you should be able to find it

I found it i believe, it's a Louis XV or XIV ECU.

XIV is the most likely out of the two, it has the letters exactly where it would make sense for it to line up. Thanks, all I needed was the DON part