On the SM 300 the "Swiss Made" is only barely visible because of the plastic crystal and I did my wrong statement based on a picture not on the physical watch.
I was about to reply and I checked, the SM 300 is on my wrist now, and is clearly written only "Swiss Made".
My mistake as partially based on the fact, and now I'm 100% sure, that a luminova replacement dial on a Rolex 1675 (installed by a RSC) had Swiss T < 25.
Sorry about that, but this is also a demonstration that watch collecting is not an exact science.
no need at all - these markings as you know have precise meanings. Some small redialler may ignore these, and write "T swiss T" on a luminova dial - just because it looks more like the original tritium dial.
But a firm like Omega gets dozens of visits from the Safety Executive etc - these markings on dials from Omega must be according both to trademark laws and Radiation protection etc.