Rolex

nickel lever movement, 26 jewels, mono-metallic compensation balance, adjusted to 5 positions and temperature, hack feature, black matte dial, luminescent triangular, dot and baton indexes, magnified aperture for date, Submariner logo in red, rotating black bezel calibrated for 60 units, water-resistant-type Oyster case with screw-down back and crown, case, dial and movement signed, with stainless steel Rolex Oyster bracelet and flip-lock clasp, accompanied by Rolex green leather covered presentation case and one extra link

This model, Ref. 1680, was launched in 1966 as the first Submariner model to feature a date aperture. The word ' Submariner' was originally printed in red lettering. Ultimately the signature was standardized to white, making examples with the red writing far more limited and thus more desirable. A similar example is illustrated in Skeet & Urul, Vintage Rolex Sports Models, 2nd Edition, p. 42.