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Volvolus
·http://omega-constellation-collectors.blogspot.com/2007/08/dial-update.html - here you can find a good walkthrough of the subject. Seems to be about 1962 they changed it from radium to tritium, first one T appeared and then they added the second T in the late 60s.
Realized that it was about the Constellation, maybe not in the other Omega models such as Genève.
