welcome Terry. first you might want to contact a moderator because your name is turquoise. I think that means you probably have 2 accounts. so you need to get that fixed. As for the differences, if you stick with this it will come over time. I couldn't tell the difference either when I first got into this. Now those differences just pop right out at me. Just do a lot of reading. Read the comparisons people have done here. There's lots of comparisons and reviews that have been done. Look closely at the font on the bezel, on the datewheel, on the dial between the gen, and the different reps. Look at the crown guards, the SEL fitment, the finish on the stainless, the lume application, The rehaut and compare the reps to the gens. The more you look and read the better you will aquaint yourself with these small details that all add up to making a watch that is as close to gen as can be. And it's not just with the sub. It's with all makes and models of the watches. Welcome. and don't forget to get the issue fixed with your name. You must have a double acccount or something.