Difficult to say. Whenever I see a dial without minute/second markers I assume it has been redialed, unless it is a very dressy watch. Some watches do have T marks regardless of any lume present, such as some of the Certina DS models. I guess it is due to the number of dials ordered; it could well be more expensive to have two different prints done as opposed to just a single one.
Here's an unlumed Certina with Ts:
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