Submariner 5513 — Double Swiss Underline

Identifying details

• Open chapter ringChapter ringA circular scale around the dial marking divisions of time. On vintage watches, the presence or absence of a ring around the minute track can distinguish dial types.

  Minute hashes not joined by an outer ring.

• Underline

  Printed underline in the dial text; understood to mark low-radiation tritiumTritiumA radioactive luminous-paint ingredient used on many vintage watches after radium. On RAF IWC Mark 11 replacement dials, an encircled T identified the tritium specification. lume, c. 1962–64.

• Double Swiss

  Two “Swiss” signatures at six o’clock.