This cartouche with calligraphic was designed by Hans Vredeman de Vries, and is now in the collection of the Rijksmuseum Amsterdam . The text (“Yo Salomon Rey de Jerusalem…”) is in Spanish; it is part of a series, issued in Antwerp in 1569.
The two snails in this design are seen in the upper border, and are symmetrical although there are slight differences in detail. Both are stylised, with relatively small shells with a large aperture; the animals have an eye and two tentacles shaped like pistils.
 RMA, RP-P-1977-150. http://hdl.handle.net/10934/RM0001.COLLECT.419040.