in mint condition

(of objects) in a perfect or unharmed condition

The idiom "in mint condition" originated from the field of numismatics, which is the study and collection of coins. It refers to the pristine state of a coin that has not been circulated or damaged, resembling the condition of a newly minted coin. Over time, the phrase has been extended to describe any object that is in a perfect, pristine, or like-new condition, often implying that it has been well-preserved or carefully maintained.

The vintage comic book was in mint condition, with no creases, tears, or signs of wear.
The collector's car, meticulously stored and maintained, was in mint condition despite its age.
The antique watch, kept in a display case and rarely worn, remained in mint condition with its original parts intact.
The limited-edition vinyl record, never played and stored in a protective sleeve, was in mint condition, retaining its high audio quality.
The sports memorabilia, signed by the athlete and stored in a sealed case, was in mint condition, preserving its value and authenticity.