Congrats on a really nice find! Due to the great condition of the surfaces of the coin, I believe that with a good soaking in Mineral Oil or Extra Virgin Olive Oil, the remaining crustations can likely removed from the coin fairly easily with the use of green Rose Thorns. Once done, it is a very good possibility that the coin will be in such nice condition that no one would ever be able to tell that it was a dug coin. Even if you tell them that it was dug, they may be very surprised. Once cleaned, just make sure that you lightly rinse it off and pat dry between the folds of a soft towel (do not rub as it can leave hairlines), then secure it in a 2x2.
Frank