Examples from the Web for eightpenny
From John Blane, during the same year, he purchased 2500 tenpenny nails and the same quantity of eightpenny nails.The Cultural History of Marlborough, Virginia|C. Malcolm Watkins
The large fivepenny, sixpenny, eightpenny, and shilling often had unusually wide margins when perforated.Peeps at Postage Stamps|Stanley Currie Johnson
Eightpenny finishing nails are the best, three in each board, the heads being driven in to admit of puttying.