Are all three from the same dealer? With the similar toning
on all three, it would raise flags, but would not make it certain that they are fakes
The Arab-Sasanian coin weighs 5.4 grams? If so, it is a fake
! Arab-Sasanian coins rarely weigh over 4 grams, with most around 3.8 grams.
As for the other two, I also believe their weights
are off, but would have to send more time checking my references.