Thanks for putting that pic up so it can be seen without clicking it- I'll have to learn that trick. When I was a kid an older logger friend of mine had a 610, and he swore it was the best saw he ever owned. He told me all about what a technical marvel it was, took it apart so that I could see the two cylinders, and even let me cut a bit with it. This of course put a burning desire in my heart to have one, and years later was lucky enough to buy this one from a landscaper friend of mine- why he had it I'll never know, but he didn't like it because it didn't cut good (the chain was so dull it didn't matter if it was on backward or forward and it was way out of tune) so I was able to get it for a good price. It was my main saw for years, cut many cords of firewood and went on many a clearing job, but after awhile I got too afraid that it might get damaged so now it's just more of a collector piece that I'll cut with once in a while just for the pleasure of using it. If you've never run one it's quite an experience, a bit heavy and slow by modern standards but so incredibly smooth and vibration free. A few years ago the logger friend gave me his well-worn (and by this time non-running) 610 as a parts saw- I'll post some pics of that if anyone's interested, it's partially disassembled and you can see that neat little opposed engine.