I opened this bottle last night but have no idea of its history. Did Rothschild own Ruinart at one point? The bottle is a 1964 Reserve Baron Philippe de Rothschild.
Here’s my tasting note:
At dinner. Brief note. Pours a deep brownish golden yellow in the glass. No effervescence is apparent. On the nose this is beautifully oxidized with a sherried/nutty note and a whiff of toffee. The palate is where this really shines showing tangy lemon, burnt orange peel, caramel, toasted hazelnuts, and very alive and fresh acidity to tie it all together. There is a touch of bubbles on the palate, but just barely there. Finish was long and complex. This was definitely well aged and a sophisticated bottle of bubbles. Lovely.

Rothschild didn’t own it but was on the Board of Ruinart. I also believe he made a loan/investment in Ruinart in the late '50’s or early '60’s (possibly that is how he became a board member) and had a number of vintages with his name on the Ruinart bottles.
Wow! What a treat! Thanks for the note and the pic!
How was the fried chicken?
It was great. Wish you could’ve been there. Would love to meet you. We’ll have to make up for it next time 
Great to know. Thanks for the info!
Elliot,
You have no idea how perturbed I was that the big rig crash on the 405 made it impossible to get over the hill. Already working on a re-do. See you at the next one.
Elliot while I have no answers to your questions I have to say that this bottle amongst so many fantastic bottles last night was as interesting as anything we drank. And yes it paired well with fried chicken! Clearly this bottle was well taken care of it’s whole life, thanks for bringing it. And you were worried it might be dead 
Wow!!!
Huge ruinart fan here. I have most of the vintages since the 1980s in my collection…and i haven’t tried that one.
I would love to get my hands on it! Very jealous here.
B