What a find! This bottle is seriously skew-whiff. It's in perfect condition and probably dates from the 1960s (that is a pure and unadulterated guess). It will make a great talking point - particularly when your inebriated guests need persuading that it is time to go home.
We have put the champagne bottle next to it to give an idea of its scale and angle of slope. But don't get the wrong idea - it is not part of the deal.