Same threads. Rolex only make one 703 crown tube. 703 is correct for a tc but I had a 704 on mine. Depends if you're that bothered. I had standard tc tube.
You keep mentioning pure time! These watches are not specific to him. They are made by the noob factory and available from many dealers. If you search noob you will get more info buddy.
I just paid £95 for my gen 2005 clasp albeit without diver extension. Also bought a gen bracelet for £300 with a bit of stretch but overall good.
You have to keep looking and be very quick to act but deals are out there!
My v6 supplied as a self build October 14 does not have this lip, it is totally smooth. I checked this before I bought a gen assembly. Will fit it when back home next month.