Caption:
Test piece in the form of an articulated bell jar, Test piece in the form of an articulated bell jar. The hexagonal chalice has a broad, convex upper edge with ornament and inscription: SAMPLE MADE BY A. STORM., A. Storm (possibly), Leeuwarden, 1770, silver (metal), filigree, h 12.6 cm × d 12.7 cm × w 207 gr