G'day, No.1 - I agree with Sap.
No.3 - it's a token. There were many produced in 1811; many with very local themes. I think yours is called a "Cornish penny", and it depicts the two major industries of Cornwall: tin-mining; and fishing.
Your token has been re-struck for tourists. Here is an example that I found on
ebay:
140334902293. The real thing comes up regularly. From the 1840s, there was a continuous exodus of Cornish tin-miners to Arizona and to South Australia, to mine copper in hard-rock. Apparently there were similarities. There is a memorial to the Cornish miners at Kapunda in South Oz. My ancestors were part of that exodus in 1845. The move was successful. They migrated as a family. I wonder if one of the kids hung on to a copper such as yours for the journey ?
Our coins teach us history, geography, art: even a humble penny can be a tangible link with so much.
Peter in Oz