The vintage watch space, once one knows enough about watches, is by far the best playing ground for getting maximum bang-4-the-buck, whether one seeks an uncomplicated piece or a superfine minute repeater or grand complication.
A couple outstanding vintage watch sellers:
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http://www.aaronfaber.com/advancedSe...Submit=Search&
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http://www.matthewbaininc.com/vintage-watches/ -- check out the Cartier Super Tank on this page
All the best.