Mumm Cuvee Napa Brut 
Country: California
Type: Sparkling
Reviews
liquidtc says: 

From Mumm:
Thank you for your email! Winemaking techniques can change slightly from year to year, as well as considering which products are within the current vintage release. We use a variety of protein and clay fining agents in our winemaking; however, the wine is filtered with a 0.45µm filtration system, which would remove any influence of those products. To be safe, we would still say they are not vegan.