Here is a couple of files I traced from necklace of my wife's. She purchased it in Segovia, Spain and was explained to be a copy of a Roman security grate used to secure the treasury there in Segovia. True? I don't know. It is a nice looking piece though. I am building the four panel file to put on our upstairs windows. They will be both copper and bronze FX'ed when all done.
Enjoy!
WSS
