Experts Opinions & Advice for 1680

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Hi all,

My first post here, have been a long time reader of this fantastic forum. Recently I have been bitten by the vintage bug.

Seeking vintage rolex experts opinions and advice for this Rolex 1680 white sub before i make an offer to the seller.

Pictures are from the seller. Edited and cropped out so as not to appear like an advertisement post.

Watch is from year 1974, 4.2 million series.

Thank you very much in advance.