Dears,

I own a 166.0136.
As I cannot see the T typical of tritium, I was wondering what kind of luminous compound had this watch.
I assumed all Geneves from 1965-1975 had tritium (like the 136.041, for example).

Thanks for your thoughts

 

Tritium. All Omegas after about 1963 will have it up to about 1997, though not all bear the T marks.

 

A lot of Omegas from the 70s haven't got any T's... It could be due to Omega, perhaps, experimenting with a different mix of luminous compound, but that is just speculation. Common for those I've seen without T's is that the compound ages differently (more grey/green-ish, not as creamy) and that it is prone to flaking of.

 

Thanks! You are the best guys!