sure is a keelback, they can be found at the tip of wa, nt, qld and all down the qld coast to the very tip of nsw coast. according to A Photographic guide to snakes and other reptiles in australia. one of the best books i ever bought.
david reed is on the lookout for a red keelback for me, hope he finds me one, would love to breed them one day, such little cuties, i thought they were live bearers but just looked it up they are egg layers
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R.I.P. Dimebag 1966-2004
..........Proud member of the coastal carpet lovers club..........
The bigger question Hornet, is what kind of coin are you using??? It works really well when having to draw comparisons! 
I zoomed in and saw the word commemorative 
