That's a card used on trailers - the top 'U' is the classification of the trailer, and the bottom 'U' is the classification of the film it's advertising.

(Before this was introduced, I remember a time when I went to the cinema to see a 'U' film - I think it was 'Return to OZ' - along with younger members of the family. One of the trailers shown was for 'The Fly', which was an '18' classification, and the trailer itself was not suitable for children. My parents were not impressed.)

Oh, and to answer your question, yes I think I've seen that card on VHS releases, when they used to have trailers on the tape before the film.