I have been searching for an authoratative reference for the size and weights of hammered coins. You can find ready references for milled, the Colchester site for one, but only passing, rare information on hammered. So far I've perused all the Rotographic publications (sorry Chris), Spinks, North Coincraft, Wren, Brooke, Linecar and even Coffin ( mainly US collecting for those puzzled), without more than the occasional passing reference. As, once you get onto Penny, Halfpenny and Farthing comparisons and throw in the various re-coinages and reigns, things do seem to be very vague Anyone know of a good site or publication for this data? I would have thought that reference books on coins would have classed this information as basic. What are your thoughts?