Is the Invicta Pro Diver 0077 good for swimming?

Yes. It is rated to 200m with a screw-down crown, which covers swimming and snorkeling. Have the crown fully screwed down and avoid pressing buttons or the bezel underwater.

How does it compare with the automatic Pro Diver models?

This one uses a quartz movement, so it is more accurate and needs no winding. The automatic versions have a sweeping seconds hand and a see-through case back but cost more and need regular wear to keep running.

What size wrist suits the 43mm case?

It fits wrists around 7 inches and up comfortably. On wrists under about 6.5 inches the case overhangs and feels heavy, so consider a smaller diver.

Does it have a sapphire crystal?

No. It uses a mineral crystal, which resists knocks but scratches more easily than sapphire. A polywatch-style polish can remove light scratches.

What comes in the box?

The watch on its stainless steel bracelet, a manual, and Invicta's yellow presentation box. Extra links for sizing are usually included.

Is it worth it against a Seiko or Casio diver?

It offers a similar dive-watch look and 200m rating for less outlay. Seiko and Casio divers typically bring better lume and finishing, so pick those if night visibility and refinement matter more than the classic Submariner styling.