The Invicta's have seduced many a watch-lover with those classic sub lines. Looks too good to be true for under a hundred bucks right?
I've pondered them many times in sale threads and auction sites. And yes, they're all "Pro Diver" and there's a dozen variants.
The classic black dial auto sub is the model 8926. The one a few steps up from that is 9937. When you see "OB" after the model, it's original bezel. They originally had the coin-edge sub style bezel, then they came out with the smoother Omega style. OB indicates the original style.
The one you're looking at is model 26971. It's a quartz, which uses a battery. Cruising down on that site is the manufacturer part number which is the actual model (Edit: I originally posted and misidentified the model as the "9094" which is the automatic version)
Look up some reviews on the 26791 and see if it's your cup of tea. As with anything, some people report good experiences with Invictas, some people have problems. Invicta capitalizes on the sub-homage style, they've nailed that look, which is great for desk diving and dress wear, but I've yet to hear of anyone who relies on one for serious tool usage.
I'm going to throw out a recommendation for Momentum brand watches. If you like a good solid diver style quartz with nods to classic Rolex and Seiko divers but have their own unique style, peruse the Momentum watch selection. I wear an M1 Pro quartz and I love it. It's been rock solid.
Good luck! Let us know how you make out!