This way it could happen that the same opus number was given to more than one of his works.

You cannot always tell from a composer's opus numbers the order in which the works were composed.

The Variations, without opus number, don't hold my interest as well.

The opus numbers do not correspond with the order of composition.

The opus numbers given to his works bear no relation to reality.

Despite the late opus number, the work is now dated between 1795 and 1798.

The list of all his compositions has 450 opus numbers.

Despite its high opus number, it was written in 1792/1793, during Beethoven's early period.

They were written in 1891 as a single large work with a single opus number.

The opus numbers of his compositions rise to almost 450.