Hello, My late grandfather left me an old coin that is a 1694 William & Mary - 2 Guinea gold piece. I have been doing a lot of research on this coin, and I found a few (in far better condition) that sold for a nice chunk of change. This one that is just about mint sold for £25,000... http://www.mhcoins.co.uk/coins/milled/william-and-mary-1688-94-16943-two-guineas/ And this one here sold for $27,600 (USD) http://images.goldbergauctions.com/php/lot_auc.php?site=1&sale=46&lot=344〈=1 My piece is not in the same condition. I tried to have it graded here in the USA by NGC, but they could not grade it for me...they sent me a sticker back with the coin that reads "GUARANTEED AUTHENTIC ONLY - DETAILS GRADE DOES NOT DETERMINE VALUE". My understanding is that this coin is extremely rare, two guineas were only minted for three years 1691, 1693 & 1694. No guineas were minted at local provincial mints. For all you experts out there, I would really like to hear what your opinions are on this coin judging from my posted pictures below. Thanks in advance everyone. Harry