Craigslist has worked very well for me for selling a vintage Strat, Custom Shop Martin, regular Martin, Dobros as well as lesser musical stuff... But I live in the home of Craigslist - The Bay Area. LOT'S of buyers and sellers of primo instruments around here.
Use common sense and your instincts as to when & where to meet people; usually a well traveled public place, but with decent acoustics if an acoustic instrument is involved.
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