"a somewhat audacious purchase from Sonerscheins - a terra-cotta bull of the fifth century"
Minoan terracotta vase in form of a bull's head (c.1450-1400 BC)
Public DomainMinoan terracotta vase in form of a bull's head (c.1450-1400 BC) - Credit: talmoryair, Wikimedia Commons
Cypriot bull mask (c.750-480 BC)
Creative Commons Attribution Share AlikeCypriot bull mask (c.750-480 BC) - Credit: Claire H., Flickr

Presumably, Sonerscheins is an antique dealers or auction house. Does anyone know?

Throughout history, and in many cultures, the bull (both real and symbolic) has had religious and mystical significance.

    

Terracotta bull from Heraklion Archaeological Museum
Creative Commons AttributionTerracotta bull from Heraklion Archaeological Museum - Credit: Jorge-ll, Flickr