It appears to still have some breast feather detail which would normally mean an AU coin. However, as Moe points out the surfaces look dull. The obverse even looks a bit granular in places. I don't see any design issues that would suggest it is a fake, but it might have a trace of "environmental damage". If the weight is normal (say, 26.4 grams minimum) I would be satisfied about authenticity. However, if I wanted this date for my collection (rather than just for accumulation) I'd look for an example with better eye appeal.