Questions regarding my Datejust 1601

[jacko_hernandez]

Good Day Friends,

I am proud to say I have finally been able to buy my first Rolex. Unfortunately, I am not quiet sure on how to tell really how old it is etc. All is know is that it has a Cal. 1570 and the ref number starts with a 17. Can anyone shed any light on my watch? It is a 2 toned Version. I was also looking at other ones online and I've noticed that some models have a small crease in their hand mine does not. Also I noticed some models have a small boarder in the clasp mine is just plain.

Thanks for the help guys! Ill attach a picture