Rolex 5513 -78 need help reg condition

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Hi good folks!

I have been a lurker for quite some time but have always find the answers for my questions, or nothing to add to question at hand. I have had several rolexes during the last years, but none "vintage". Now i have started to crave a 5513 from my birth year which is -78. I have found a specimen but i have problems judging the condition of the watch. I know that the dial is´nt the guilt one as it is supposed to, but the seller is providing a white gold trimmed service dial as well as the meters first one. I now this, the dial dilemma, is a big turn of, but i like the watch.

I hope some kind soul could help me out.

Please see my MobileMe gallery, i could not post the pictures in the thread.

http://gallery.me.com/jonis