Need help determining a good buy

Hey there everyone! First time on here and hoping to get some help.

Over the last year I've gotten more into watches and recently have been eyeing some vintage Omegas (Seamasters to be specific). Anyway, I saw this one on eBay recently and while it looks good and in good condition, I was hoping for some more advise on it since I don't want to spend $350 on a bad purchase. Also, if anyone seen any other good listings, feel free to mention them as well! I'm open to suggestions.

Heres the link and thanks again:
http://www.ebay.com/itm/Vintage-Mens-Omega-Seamaster-Cosmic-166-026-Cal-565-Auto-Date-Wrist-Watch/131532807346?_trksid=p2045573.c100034.m2102&_trkparms=aid=222007&algo=SIC.MBE&ao=1&asc=31478&meid=ae01886913ae4eedbcc5f935b91f8e58&pid=100034&rk=1&rkt=8&mehot=pp&sd=391151902677

Additionally, is the crack in the crystal a major worry? Or the lack of test for accuracy?

I'd be more worried about buying it without seeing the movement. The listing mentions this but there appears to be damage to the dial, at the 3 o'clock, that looks to have been poorly painted (look at the 4 o'clock marker), not just damage to the clear finish.

Ok, thank you! This is my first venture into buying vintage and so I'm trying to be careful and look for a solid purchase.

Look at the watches for sale on this site. You know, pretty much, what you're getting and if you find something and have questions, post photos. The members will tell you what they think.