That Liberian coin is fascinating. It appears, from the 'ghosted' portions of reverse, that he may have simply re-used and re-engraved a Cartwheel twopence or one penny die? It would be interesting to know the dimensions of the Liberia coin. Sorry. Been at work. To answer the questions the Liberia cent is smaller than cartwheels. 28mm, 9g of copper so closer to the Isle of Man halfpenny .... . Thanks Tom. Those are interesting marks on the reverse though.