Hsien Feng reign
1851-1861
demonination: 5-cash
Don.......
Edit:The one cash coins have the standard two character mint marks on the reverses, while higher denominations have four characters with the extra two to show the denomination.
It is worth a few dollars. The attribution from Mackaydon is correct. The surface looks a little grainy to me, but it could be just corrosion or something natural happening to the coins. Keep in mind these are faked by the millions to make jewelry.