Marco, is it a Carrera 30 as in the title, or a Carrera 45 as in the body text?
Around the introduction of the 30s, Heuer seemed to have been experimenting with alternatives to tritium (LumiNova etc), so it is fairly usual for a Carrera 30 not to have a T on the dial, just the Swiss text. This appears to have started a year or two before then as well, so late Carrera 45s and first execution 12s sometimes appear without a T as well.
A good rule of thumb is that if a first-generation Carrera dial is second execution (i.e. the markers have inserts), then it is unlikely to have a T on the dial, whereas if it is first execution (plain markers), then it is usual to have the T.
Tritium is far less harmful than the early radium, but export controls seems to have been an issue as it is still radioactive.
So the watch could well be ok. You can send any photos to me on carrera_table_mm@btinternet.com to take a look at if you like.
Mark
