It's a Parthian coin of some sort, but the style here looks odd to me, and so does that combination of weight and diameter. You might want to check the authenticity with people who know these coins better.
Another coin from same collection I posted a while back a few coins. This is from the same collection of mostly Judean coins avi
Not proficient? Hm? The First Revolt prutah you posted last doesn't look too good. Try uploading the pics to another site, like photobucket. Cointalk automatically scales down images that are too large.