Need help identifying Year of Wine

[Kcwhippet]

I know the Mountain White Chablis was available in 1954, because I remember seeing a few bottles of it at home. Chances are it probably goes back to about 1951 when the descendants of the original owners regained control. I don't know about now, but from its inception through at least the 80's, the Mountain White Chablis was 100% colombard with not a drop of Chardonnay.