Recently I acquired a unique 1696 sixpence from an auction house in UK. The coin is a 1696 sixpence (First Bust, early Harp variety), but the coin is significantly double struck. The coin is graded by ngc as MINT ERROR MS 65 DOUBLE STRUCK. I have seen double striking in 17th early milled coin, but very few of those error coins can survive in a real uncirculated condition. What is more, the degree of the double struck is significant. I am not sure if I can consider my coin as a new variety of 1696 sixpence, but this coin is definitely unique.
 
	Here is the photo of my coin (the first taken by auction house, the second and the last by myself).