The following instrument was written on a napkin: "I, the undersigned, do acknowledge that I owe Vladimir Lenin ten thousand rubles, with interest, payable at Moscow out of the proceeds of the sale next month of my dacha in St. Petersburg. Payment is due on or before six months from this date. Signed at Berin, Otto von Bismark. Is this instrument negotiable? Why?
Answer should be at least 300 words, and any reference used should be in APA format.