Thank you Alberto for arranging the photos this way and perhaps you have altered the sizes as both yours and my coin seem to be the same size. Anyway I have
had my micrometer out and measured between the tips of certain letters and the measurements are the same so I think that proves conclusively that these are in fact stamped from the same dies. Two thoughts one is the
crack across the forehead of your example is it in your opinion a
crack in the coin or is it a
crack that has appeared in the die itself ....of course you can only
hazard a guess but I wonder if your coin was at the end of the life for this particular die as it
had produced a fault. Secondly in my mind there are more examples of
COS IIII that are being wrongly attributed as
COS III I will put an example up from the museum to see what you think. I have never found a die match coin before and I am truly excited at being able to look at them together you can see my coin was struck low getting the whole of the
legend in at the top where as yours was struck high missing a fraction of the top and getting all the bottom
legend in. It shows me how tight these coins were and to get an exact strike was in the lap of the gods. Adding the link to the museum coin which I also believe is a
COS IIII but reading the write up it is thought to be a
COS III, http://collections.museumoflondon.org.uk/Online/object.aspx?objectID=object-754722 ....... Since contacting them by e mail they have revised their description of the coin and now put the correct
obverse legend COS IIII