The second one is definitely polished, top and bottom should be brushed in a sunburst pattern with only the sides a mirror finish. The photos X350 posted are an excellent example of what the case should look like. The new seller and lack of movement shot make me skittish though.

I'd see if you can get the seller to send better photos of this one: https://www.chrono24.com/omega/seamaster-120--id8694730.htm