Vintage question

[June]

I was scanning the award winning wines at the Jerry D. Mead New World Internation Wine Competition and found a wine I thought I would like to try.

However, I am wondering about the vintage. In the category Sparkling Wines, Residual Sugar: 0 - 0.5%, Over $22.01, it lists Mumm Cuvee Napa, DVX, California two times. There is no vintage listed, but I think there should be a vintage. It does not say that it is non-vintage.

I looked (probably not carefully enough!) to see if I could contact the site to ask this question, but to no avail. So, I post two questions to any who can answer.

1) Do you know how I can contact that site;
2) How can I determine what, if any vintage is associated with these two wines?

Thanks for any help you can give.