I think the "key to unlocking" their mystery is figuring out how to display them. They can become decorative pieces by themselves or in a picture frame. Here we tied them up in vintage seam binding which softens them up a little bit and adds color.
The keys above are available in our store,Bella Rosa Antiques, and I do believe they are brass.
What ideas do you have for collecting vintage keys? Feel free to leave me a comment.