Help a beginner out! I purchased my first unidentified hammered silver coin and while I am pretty confident it is an Edward The something Penny I am not sure which Edward. Let alone the mint. I have done considerable research online and made good use of my copy of Spinks Coins of England plus "Englands Striking History" but I am stumped. I have taken the best photos I can, the top 2 are not quite a natural colour, I have enhanced the contrast a little to aid identification. The bottom is near natural colour. The coin is 20mm diameter. Cannot give a weight yet (scales on order). The coin 'feels right' and is worn.

I believe the obverse text is EDWARD REX ANGL DN. Reverse more difficult, possibly COM G/R U/V EC NIVA IIP/K E.  Pellet before the E of EDWARD.

The N is of the Lombardic style.
The cross mintmark is typical of Edward 3. 

Can someone can tell me if this is a tri-foliate crown or not?

Oh, and if this is a modern copy, break it to me gently but this coin was pretty cheap.Thanks in advance, Pete