New: Watch that has never been worn, has no previous owner and comes with the original box and all papers.
Unworn: Watch that possibly (that is not necessarily!) Had a first-time buyer, but has NEVER been worn and comes with the original box and all papers.
like New: Watch that may have been worn a few times, but WITHOUT any visible marks and usually with the original box and all papers.
very good condition: Watch that has no or only minimal signs of wear, if with a leather strap, then with a new / as good as new leather strap and usually with the original box and papers.
good condition: A watch that is age-appropriate but has no scratches, flaws or damage.
Vintage: We call all models vintage or antique that are no longer in production.