I paid $500 for mine 2 years ago. It is not quite as nice as yours. Looking at the auction sites I think $650-$700 would be a good starting point. Good luck in the sale. They are great rifles.
I've seen several .308's for sale in the local racks for $550.00. Not nearly as nice as your pictures and also not .358's. You will love it as I do my 81! I do hunt with mine and covered the rear stock with a neoprene slip on sleeve to protect the finish.