There is more about V-Mail on The History Channel
Letters from WW II
C.H. (Cecil) Prince
Great Uncle, Grandmother's brother on Dad's side of the family.
I found three V-Mail letters from him, to my grandmother.
Dated July 14, 1944 (while at sea)
Dated April 28, 1945 (while at sea)
Dated June 8, 1945 (while at sea)