I don't see how the dial was converted. The printing, the finish, the font script all perfect. The lume plots were applied, as well as look, consistently with old tritium lume. It just has the modern S, that along with T's indicating the year 90-95, later than the grey and blue 24 hour dials. In fact, I don't see any error with this dial, better than all of the 8 dials in your previous post. It's the best of the unusual bunch. If it shows up on other 009 watches then it would be later service dial. If this is the only one, it must be a test dial, a proper and legitimate one, for service replacement.
Hope I'm not too biased with this one as I was quite excited seeing it. I once switched my Seamaster silver-black dial with blue hands into the 009 case and it made a brilliant combination, the contrast was just so striking in real life!
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