Physical description

A Brunsviga twin-system with keys 10x10x20 and 12x20.

Inscriptions & markings

Plaque: TRINKS Double System / GRIMME NATALIS & Co / Braunschweig / AND Brunsviga Calculator Co. / London, Brunsviga House / Snow Hill EC1[London] / Manchester, WIlliam Brown Street / Glasgow, 20 West Campbell St.