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800-2000 bucks is the market. The 80s Artists go for less than the 70s. I would offer 900 or so and see what happens. Really though if you want an Artist I would search for one that is a little earlier. 2 cents!
I recently scored mine for $600 on consignment - was able to talk him down as there was quite a bit of cosmetic wear and tear. Still plays great though.