This is an old GM-8, with encoders, Piers, and control box.  I've had it for at least 15-years but I've seldom used it as I am a visual observer. I've cleaned the drive and have stored the mount upright. I bought it for about $1200 from S&S Optika. The servos work fine, in fact, I replace one of the motors. It probably need a new control board and I found some online stores to buy a new one but I don't have the time. In addition, I am moving to St. George, Utah by the end of March 2024. We are closing on a house there. I bought the GM 8 for $1200 and will let it go for $120.00, so it is 90% percent off.  If I can't sell it for $120.00 I will just take it with me. If anyone is interested just give me a call at 626-731-4289 or via email at Juan@thedbsolutions.net . I've enjoyed being part of DAS for the last 20-years.