Yes, as above, definitely a service dial. Nothing wrong with that as long as it's priced accordingly (and the seller has disclosed that fact).
The easiest way to tell the difference between an original MK4 and service dial is to look at the first "R" in "Explorer." On an original MK4 dial, it's centered directly under the second "E" in "Perpetual," unlike on the service dial.
Also, despite the "T" marking for tritium on the dial, it might actually be luminova, so a flashlight or UV light can give you your answer without analyzing font.
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