Where Did the Term "Mint Condition" Come From?

By GovMint :

The term "mint condition" originates from the world of numismatics which is the study and collection of coins. Mint condition describes the pristine state of a coin as it leaves the facility where coins are produced. This term was initially used to indicate that a coin had not been circulated or damaged, maintaining its original, flawless appearance. Over time, "mint condition" has been adopted more broadly to describe any item that is in perfect, like-new condition, suggesting it has been well-preserved or carefully maintained.

Sources Used:

https://dictionary.langeek.co/en/word/213427?entry=in%20mint%20condition