What is the most valuable dollar coin in the world?
Could you please elaborate on what factors determine the value of a dollar coin, and furthermore, which specific dollar coin is considered the most valuable in the world? Is it based solely on its rarity, or does it involve other elements like historical significance, condition, or perhaps a unique design? Also, are there any recent examples of dollar coins that have fetched exceptionally high prices, and if so, what were the circumstances surrounding those sales? It would be fascinating to hear more about this fascinating topic and understand the nuances that determine the worth of these collectible coins.