I have two stunning and untouched ( I think) 14755-61. Movement nr. 19025***. With only 8 SN difference. Both produced in November 1962 and shipped to Italy. Both with extract of archives. One bought in Florence some years ago ( was one of the first entered in my collection
馃グ) and one in Sicily this year.
They have tritium on the dials and the same patina. My conclusion is that at some point in the 14755-61 production Omega replaced the radium with the tritium.. Sorry for the blurry and horrible photo..
Nico.