« Gilt Underline »
Following a change of regulation by the Atomic Energy Commission in the early 60s it was imposed to lower the radiation used in the dials. Rolex did not want to throw away all its pre-printed « SWISS » dials (meaning luminous in radium) and decided to put a small horizontal grey/white line (the underline!) on its freshly adapted compliant dials. This is only correct for year 1963 and 1964.
Serial: 875,xxx (1963) belongs to the accepted range of underline dials https://gmtmaster1675.com/type-b/
Dial: superb « type B » gilt dial with lower underline single SWISS. Puffy tritium index which are still perfectly glowing/vanishing under UV test. Hands are matching the period (small GMT hand) and tritium.
Case: as close as possible of NOS condition. Truly mind-blowing case. Case back is engraved I.63 for first quarter of 1963.
Bezel: original faded fat font bezel .
Mouvement: Valjoux 1560.
Bracelet: oyster bracelet 7206, 75 end links, slightly later clasp 2 65.
Box & Papers: none.