What is the rarest non-error coin in US numismatics?
Could you elaborate on what is considered the rarest non-error coin in the realm of United States numismatics? I'm particularly interested in understanding the rarity factor, as well as the historical significance and potential value of such a coin. In your explanation, please detail any distinguishing characteristics or circumstances surrounding its minting and eventual scarcity. Additionally, are there any notable collectors or institutions that possess such a rare coin, and how do they safeguard it from the public eye? I'm fascinated by the world of rare coins and would appreciate your insights on this intriguing topic.