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Find me a piece of string. Measure it.
SO many variables to consider: mirror condition (both mirrors), focuser, extras included, cosmetic condition, wear and tear, rust and so on.
Generally, a second hand EQ6 runs $1000 to $1200, but if it is 8 years old - one of the older ones - it will be less as these had initial QC issues (especially the motor board, axis shims and bearing quality), and had the single puck with only the Vixen dovetail. I have seen the "First Gen" EQ6's for as low as $700 (I piad $600 for mine, and it had been "hypertuned").
Does the mount have the Synscan GOTO, or is it one of the early non-GOTO mounts? If it is non-GOTO, it's going to dramatically lower the resale price.
As to the telescope, which model? Is it a fast Newt, say f/4 or f/5? Or is it a slower visualNewt (f/6 and above). Is it a blue tube? Does it have the single speed focuser, or the dual speed focuser?
Post some pictures, and go from there. Just SO many variables, it really is, without pictures, a "How long is a piece of string" question.
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