1934F103.8 Signet Matrix - Seal Matrix, 1800-1850 Possibly made in Birmingham Presented by Francis Buckley, 1934. A 'signet' or 'seal matrix' is a small stamp used for impressing the mark of its owner in wax onto documents. This is one of a collection of twenty-seven acquired by the museum in 1934. The majority of examples are finely made of moulded translucent glass, in this case an opalescent colour. This example has a design of an early type of railway locomotive.