To me it looks like the item you would use to pin your kilt together. Look up Kilt Pin Brooches on ebay and you can see some that look like it. Vintage Silver Penannular Brooch Kilt Pin Dragon Motif | eBay
My wife would use it to pin up her hair. That way she would have something handy to stab me with if I misbehaved.
It would get the job done too. It is sharp!! I Suncoke some self with it!
Suncoke?
Suncoke would be a good name for a Florida town.