If I was to sell it what would the right way to go about it?

Sorry, haven't been able to upload more pics , stupid iPhones

[attachment=3029]G'day, I come across this fifty cent a couple of years ago, It come to my attention because the coke machine wouldn't accept it, on closer inspection it appeared to have a seam, I took it home and with a little help it split in two, now I have seen some others on eBay and coin forums but not the fifty cent, so my questions would be , are they common and are the collectable, any info would be greatly appreciated