What is the origin of the idiom "good as new" and when to use it?

The idiom "good as new" originated in the late 19th century and is used to describe something that has been restored or repaired to its original condition, resembling a state of being brand new. The phrase suggests that the item or object in question is in excellent or pristine condition, as if it had never been used or experienced any wear or damage. It implies a successful restoration or refurbishment, resulting in a product that is indistinguishable from its original state.