Is this a roman coin?

[DrewG]

Hello all,
I'm new here, long time reader of the old forums, and I decided to register here a while ago.
Anyway, I came across a coin in my collection, I have coins from all over the world and I found this very old one. It's in good condition considering it's age.
I was wondering if it was Roman, I have no idea, I think it might be, but the runes are different so I have my doubts.
Here's the front of the coin:


And here is the back of the coin:


I thought because of the head it might not be Roman because the person is wearing a crown, and for all I know Roman emperors didn't wear crowns.

Anyway, all help is appreciated, if you can identify where it comes from, and possibly an estimate of a date when it was used.

Thanks in advance.