Re. my 1853 penny study, the other interesting thing which I noted was that none of the Plain Trident pieces were above a GVF grade, and only a handful around VF...….most were complete tat. My italic 5 piece which I pictured earlier was found outside my 5 year study period. There are some better grade pieces around, because a handful have been sold, for example, by London Coins in the past few years...………….. including one with the italic 5 date in June 2017 for hammer of £400:-
http://www.londoncoins.co.uk/?page=Pastresults&auc=157&searchlot=2969&searchtype=2