I think Ihave the oldest and slowest combine in the state of iowa, it is a john deere 6600 gear drive with over 5400 hours on it,Irun a 6 row narrow on it, also 13 ft bean head , I also do some oats. In corn I run in low gear about [email protected]/2 miles an hour ,Ikeep snouts real close to the ground, I like to try and get every ear..Iwould like to find a nice 7720. Where is this one worth the most money,an auction, salvage yard or a scrap yard? jd4620