So far, the only white Amaryllis bred by Ton Peter van Nieuwkerk. At Least, when we are talking about single flowered Amaryllises because he also introduced the marvellous double flowered Amaryllis White Nymph.
In my opinion Antarctica always was the whitest but nowadays she has a good opponent with the recent newcomer Moscow. Antarctica grows a vigorous but sturdy plant with clean flowers turning the winter even whiter.