Yep. What’s left of the La Questa Vineyard was planted between 1895-1905 with cuttings from Ch. Margaux. Martin Ray used cuttings from La Questa to plant his Mount Eden Vineyard. Also, most of the Cab on the Monte Bello ridge was derived from these cuttings, as well as the Kathryn Kennedy Estate Vyd.
I’ve heard the oldest Cab vines on Monte Bello were planted in 1949 and are part of the William Short Vyd. (where the tasting room is), but I wouldn’t be surprised if there’s older Cab in the Picchetti Vyd.