I have a 500NE and i�ts stampt ELEY LONDON how mutch is it worth

ruger, I don't have that precise headstamp in my database of sales, so it could be a rarity and worth substantially more, but other Eley headstamp rounds in this caliber of approximately the same era have sold for US $10 - 20 over the past three years, depending on the headstamp, condition and venue of sale.