A coin with extremely low mintage...

...with 8-15 total surviving at both TPG's. Zero previous auction records from two major auction houses to help with the history of prices and an idea of supply and demand how does one value a coin?

I purposely left some or most info vague as I'm looking at two coins in this category and I'm hoping for a more generic answer or advice than about a specific coin, nor do I need any more bidders. I only collect American, 19th century gold and silver. Several Auction venues offer estimates, price history and Heritage has its own index which is right more often than not. How did they reach a value?

My wife knows I'm not happy about these coins. Normally, when spending this kind of money; everyone's different; I would have one of two numismatist I trust preview it for me or hope for a CAC sticker for guidence but no to both on these. I have the worlds greatest wife, this is what she had to say. Also, can you guess what she has hated for 30+ years? Wife: just look at it as something you like or love; not in a dollar amount or type of financial vehicle. Just like every upgrade to that GD boat.

I don't mind breaking even after enjoying something but I'd hate to loose 80%+.

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