Help with my first Omega

I suspect that the second one is a re-dial. At the very least, the lume has been removed.

The first one is quite expensive for the condition, obviously, but looks generally legit at first glance, although I haven't checked to see if all the parts are consistent. This could be a trick of the lighting, but it appears that the movement may have been repaired with a replacement rotor (looks like gold-colored vs. copper-colored plating in the photo). You could double-check this if it bothers you. If you are serious about the watch, you might want to double-check that this caliber and serial are correct for this reference.

If I were in your position I’d have a careful trawl through eBay to compare conditions and prices of vintage Seamasters - both for sale and sold.

My initial view is that these watches are about 30-40% up on what I’d expect but I haven’t done a price comparison check for some time.