[Doc]

tough one Jez. I'll have a go.

He doesn't put you on ace I think, given your call. His likely read of you is that paired the flop and picked up a draw on the turn.
He calls a pot size bet on the flop. That doesn't mean much here, but he probably has at least a pair, given the dry board. You check the turn and he probably thinks his 7 or 4 is good. He may have a weak king also, but less likely IMO. I don't think he has trips - he would probably have raised pre-flop, and two pair raises the flop I think.
The river doesn't complete any draws. His bet looks to me like he wants a call. Hard to put him on an ace, unless he is being tricky with AK

However, your bet, call and check-raise says big hand. If he is capable of some decent play he has to realise this. He is basically betting 600 to win 500 if he thinks you might be bluffing. He could just call the 160 raise to bluff catch with a moderate hand.

I think he has a big hand here - at least 2 pair (probably equal or better than yours) and I don't rule out KK.

I fold.