Condition, usage, box , 3T's all make a difference. I would say 550 to 700, depending on options. Remember different parts of the country seem to bring different prices. i paid more than that for a 19-4. NIB and docs, box, 3 T's etc. Why, because I wanted it, and sometimes the fine( pristine ) stuff you have to pay more, because you want it, and they do not appear every day

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Pete
I ain't no fortunate son