Based on a piece in a painting by Carlo Crivelli (1480), Mary Magdalene.  A beautiful buckle shown in the 15th Century painting.  The painting was used as an alter piece and the buckle is a feature in the painting.  3 3/8" x  2 3/4" for a 1 5/8" belt, 8.7 x 7 cm for a 4.3 cm belt