Submariner 16613 blue dial

[William Ramos]

Since I saw the first Rolex Submariner blu dial I got mesmerized I and I set a goal of owning one of them. I am at the stage of buying a pre owned, But I have some questions< how many blue dials are? I 've seen pictures with different kind of blue? Why some submariners looking exactly the same have a price difference? But most important, which internet rolex
sellers are recommended? or just by chance because I'm visiting Washington DC in mid september, is there reliable rolex preowned sellers?

Thanks