Ive now found lots of Dirges on Ebay with the 'Ages 7 and up' so im no longer concerned there. BUT, all of them have the serial 5985/5785 and this one has 5985/5784?? I cant find another one with this.
From memory, I think 5985/5784 means (confusingly) it was the final US version of Dirge released, and he was only one per case, so there might not be too many on eBay.