87 690d value

I've got an old 690d it's a 1987 with I believe around 10000 hours. It's not pretty and something with the hydraulic us a little off. They are plenty strong, just can't carry grade to save my life, it's great for pulling trees or bulking diet starts on the coldest days and runs out nice. I am thinking of upgrading excavators in the next 24 months. If I was to trade or sell this unit what would everyone consider a good value? Just figure it being rough in condition for your estimated value

87 690d value