rolex 15505 verify and Price?

[rabbittail]

Happen to be given an offer of rolex 15505
I m a newbie in this and is trying to get help for veryfying the originality, version and the price however much i can from the forum.
I find a lot of different version of the 15505 from the internet.
The price is about 1100 usd (no papers and box) which i think is pretty good price, but is it?
However i am hearing a much louder ticking noise from the watch compared to my datejust, submarine and deep sea. I can practically hear it without putting the watch close to my ears. That is not a good sign i believe.

These are the pictures i took from my phone.

I appreciate any help

Thank you