These nine keys are called Skeleton keys, they are French and they are antique dating from around 1900.
These keys are very popular and have so many uses. My favorite way to use them is tied with a piece of twine and a stalk of lavender on a napkin as a napkin ring.
I like to glue a few of them on a piece of linen and frame it. Hanging in a guest room would make a lovely wall piece. Another use for them is in gift wrapping. I like to add one tied onto a gift with a piece of twine. I am sure you will think of many more uses for these one of a kind keys.