I though for a minute it was S.1526 (which would have made you very happy), but yours has Roman N's... If it's Edward III (which i have my doubts now, see below) then i think it's from the third coinage... probably S.1545 or S.1546 So the cross probably is the one you said but not very well defined, probably from a later die striking hence why it's joined up looking more like cross 1, than the patee ones you thought. I've looked at the class 'C' coins that have the Cross 1, Closed E, wedgetail R, and Roman N's pretty much like yours but they look more like the groats than they do your penny. See... S.1584. I do believe however that it might not be Edward III at all, it's probably class 15b or c of Edward II. Which would explain why class 15d was so close... the only difference between classes b-c and d (other than the price tag) is the N's. See what you think. I'm gonna have a look through Edward I later... (if in doubt say what i always say... Cl 4d)