I would not let anyone touch that dial!. Especially if you want to sell it. A redialed Naiad is of little value in my opinion. An inperfect Naiad is maybe of not much value.
BUT: The sentimental value of this watch must be very high. I don't understand your desire to sell it, to be honest, as i estimate the sentimental value much higher than market value (redial or not). But it is your watch.