Q2. This is almost like asking, what is the length of a piece of string
I think you have to decide what your budget is first and work from there. As a yardstick, expect to pay 1000 - 1200 USD for a 166.079 (cal 752) or 166.145 (cal 565) Geneve Dynamic in top condition, remembering that there are plenty of also-rans that come cheaper but the better quality pieces don't come cheap and are harder to find.
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