The coin belongs to Group J of Series Y (Class I/III transition). These coins are among the most enigmatic of the series, and have fooled everyone until now. When you read about them in the link below, you might wonder why they were so problematical. A lot of things are easy when you know the answer!
Information on Group J
Explain the boar symbol
c. John Hooker 1996 email@example.com
Here is an example of one of these coins.