The Matrix Collection includes a number of eighteenth and nineteenth century seal boxes. Usually circular, and made of turned wood, they would contain the wax impression of a newly engraved seal and would be given to customers with the new seal itself. Inside the lid, the supplier of the seal, whether specialised engraver or local jeweller, would paste his label. Much as with watch papers, this was both an opportunity for self-advertisement and a chance to show off engraving skills.