Seals are fascinating objects and many are works of art in themselves. Seals go back almost as far as the beginning of writing itself - the seals on the cuneiform envelope for example. Mesopotamian seals range from the simple to the very intricate, especially when you consider the 'primitive' tools they had at their disposal. I had a personal seal made for me in Beijing using a modern machine with excellent results, but it was equalled by many of the very early seals made with bow-saws, chisels and gouges.
The seals in the collection range from the early through Greece and Rome to the medieval, such as the Royal Seal of Henry VIII, thence to the modern and Asiatic.