InvictaMen's Pro Diver Collection Automatic Watch

Hi everybody, i am confused about model numbers of this watch, automatic or with battery no matter but what's the difference between 8926 and 8926 OB?

Does this watch Have a NH35A movement? Description doesn't say.

Does the Invicta 8926 Pro Diver have a screw down crown?

Does the second hand works as in a smooth sweeping motion similar to automatic Rolex motion or jumping quartz motion?