Which No Cash Value eagle token do I have?

There seem to be a lot of different variation of this token.  The one I found at an 1860s house location has 90 denticles on the eagle side and 72 denticles on the other side.  It measures 25.1 mm diameter and 1.5 mm thickness.  Could it be the original design piece?

Yours looks to be iron.  Is it magnetic?

No, it is brass.  It was found with a metal detector and they tell you when it is iron.  I don't dig iron.