What a neat idea! This little copper charm might also be a pendant, depending on the way you use it.
Each of these envelopes has a hinged articulated top that opens and closes. Although there is no latch, it remains nicely closed by design. The charm measures 13/16 inch across by 5/8 inch high (not including the little hanging loops on either side of the envelope(. You just might choose to hang it by one loop and hang another dangly from the other loop.
The letter inside reads:
Our envelope is antiqued brass with a lovely patina, as is the letter inside. We're showing 2 charms so that you might see the envelope open and closed.