Here's a closer view of the brooch:
All of the chains used are also vintage, and are really quite unique. I think they fit well with the brooch because they are elegant but certainly not over the top. The 2nd and 4th chains are exceptionally brilliant from futher away, while the other three have really nice patterns that you can see closer up.
For the back, I put links with crystal which aren't vintage, but fit really well with the brooch stylistically. There are four of these larger hoops connected by the links as well as a decorated "S" clasp to allow micro adjustments to the length.
Let me know what you think!