noun, noun which may take the genitive case particle 'no'
old and new; old but unused
Describes something that is both old and new, or old but in unused condition. Often used for second-hand items that are like new, or for a mix of old and new things.
I bought an old but unused item cheaply.
この店では新古の家具を扱っている。
This shop deals in old and new furniture.
new old stock; NOS; unused old goods
remaindered book; discounted new book
as-new car; pre-registered car; ex-demo car
secondhand bookstore dealing in relatively new books
neoclassical school (of economics)
previously owned but unoccupied condominium
Compound of 新 (new) and 古 (old). The exact origin is uncertain, but it likely arose from commercial contexts to describe items that are old stock but unused.