So I Regretted Selling the GMT Master 1675..

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You need better pics of the lugs to make a determination on the case. In one of the pics it appears that one of the springbars is extruding from the lug hole, which is a sign of overpolishing. That would be a show stopper for me, frankly.
 
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I always look for the facet on the crown guard above and below the crown...you want that facet...it gets polished away pretty easily as this one shows.

All depends on price.
 
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the lug holes give a bit of information too regarding previous polishing. They appear a certain way unpolished and cover the spring bars tip to a different degree.