At one time they had the date of bottling on the label.

I've recently 'acquired' a couple of bottles dated 1954 and 1960 - and another that has LC where the date is on the others.

Are they likely to be drinkable? (not by me - I have to confess to not being able to stand the stuff) Or even of collectable value?

They are unopened though probably not sotored in ideal conditions