Watch experts plz help me value

I have a old omega constellation. I got it from my father and he got it from my grandpa. According to my father its atleast 50 years old. Probably 60 or more.

On it it says "Automatic chronometer officialy certified" but that is about it. I cant find any stamp with the year. I added 2 pics of the watch but my crappy shit camera cant take close upp pictures so they are to blury.

It looks exactly like this one. But black instead of gold
http://clockmaker.com.au/w/omega564_4.jpg

The digits and other stuff on the watch is gold. The gold ring that is suposed to be around the glas is gone and so is 2 of the gold digit lines(my dad realy didnt take care of the watch).

It is abused and that is to bad. The glas is about to fall off to. But the watch works perfectly and is a automat

Here is a pic that is EXACTLY like my watch but my watch has a square where it shows date(like the golden one in the other pic)

http://www.tijdloos-horloges.nl/horl...stellation.jpg

Im gonna dig on omegas homepage and se if I can find the modell. But I hope the info given here might be of use to atleast give me a decent value. I guessing in its current condition that its worth maby 400 bucks or so??

Also would it be worth it to send it down to omega and repair it? Would the cost of making it into mint condition be more then what more I would get from selling it in that condition.

well just found out it cant be more then 52 years old since the first constellation arrived 1952

It MUST be this modell but with black dial instead of gold

http://clockmaker.com.au/w/omega564.html