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Dear Nakihunter,
If you buy new, you pay what you get(and then, Sabattis are among the cheapest but nearly always the most accurate doubles). If you buy used, better be certain about your knowledge to see a fraud. I think doubles are a snob game these day's. I never paid more than 2500 dollar for a double, and that includes a Chapuis 9.3, a Krieghoff .458, a Westley Richards .450NE, a Pire 9.3 ...(all in new condition)
Livinus