An antique early 17th century colored copper engraving, map of Bolsward, ‘Bolsvardia Civitas An Zeatica Condita Anno Christi DCCXIII.’. Presumably by Matthäus Merian, engraved by Nicolaes van Geelkercken, 1638. Provenance: antiquarian Jille B. Westerhof, Sneek.