Crocus 'Wit' - I can't find any verification for this on the internet but have an empty packet and plant label from different sources giving Wit as the name, so would be interested to know if anyone else has them?
I think Wit is just the dutch word for 'White', did the bulbs come directly from Holland maybe? It might just be a white unnamed vernus hybrid. When the flowers open, see if you can get another photo as there is a variety called Jeanne d'Arc which has two/three thin lilac stripes inside the flower. It also has bright orange and frilly stigmas