Mmisprinted coin value?

I have a 1978 australian 1c coin with a metalic imprint, just want to know wat its wort, from wat I can remember when I took it to the canberra mint they couldn't say if it was a genuine misprint but told Me it was uncurculated. While I was there I had a look around and found a plate the coins sit in when they get printed, it had a print of a 1c coin and fragments of the plate where missing, I'm hinking the plate misalignd and the fragments went flying printing on to outher coins... but yeh I just want to know a value..thxx