Can someone tell me how much this imported 1972 bmw600/5, would be worth,assuming the bike is in tidy condition.The bike has not been used for approx 5years been garaged and has 78000 mls on clock, it has new down-pipes and silencers, refurbished wheels with new stainless spokes,new battery, mot`d for a near.Does not have pannier cases or screen.Please help.Eck.