Any piece of gear is impossible to value without knowing the condition and seeing detailed photos. You don't even mention whether it is in good working condition.
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Sell it for the same price as the one you ''picked it up for'' since your question shows strong signs that you do not know much about turntables, and therefore you are probably unable to identify current problems that may be present and that could be passed on to the next buyer.
Not much good advice you may think, but an ethical choice for sure.