a very rusty key

This iron key seems very ancient indeed. Flakes of rust shower from it; it seems ready to crumble completely at any moment.

It is a very rusty key.
It weighs about one pound.

You identify a very rusty key.
It is an unsellable key.
It weighs one pound and two ounces, and it is worth about five celeb.
Its keywords are key and rusty.