Overall (left wing): 8 5/8 x 2 1/16 x 1/16 in. (21.9 x 5.3 x 0.1 cm)
As a triptych with 90.3.9a-c: 8 5/8 x 11 1/4 x 1/16 in. (21.9 x 28.5 x 0.1 cm)
Bequest of Mrs. A. M. Minturn, 1890
On view at The Met Fifth Avenue in Gallery 306
The technique of punched dots (opus punctorium) to create a composition originated with goldsmith work and in many respects is a precursor to the art of engraving. Originally forming a triptych, the attendant Bishop saint may associate this devotional object with a specific city such as Cologne or Mainz.