Being labeled only "Genuine" makes it difficult to determine a value without some understanding why it couldn't be graded. Nowadays NGC would accept the coin and give a "Details" grading. Perhaps this coin was damaged and specifically restored by NCS.
I couldn't find the NCS slab ID in the NGC registry. Does that registry have NCS coins?
Looking at the coin I'd give it a VG-F grading. At a 50% discount to trend, due to the unspecified issue that prevents grading, that would put a trend value of $20,000. But, buying a huge ticket item on ebay without being able to get some opinions, is foolish. So, I think anyone willing would expect an exceptional discount. But the $15K was still below the reserve price.



















