Is it a style (does not look western style)? Is it the steel? Are all cupped tsuba Namban and why? Is namban word used only for western influence?...   A picture of a tsuba I recently got with its description, is it namban:   Waterwheel mon and Vines design. 7.25cm x 6.95cm x 0.9cm in bowl depth.   This guard is cupped in the European style, but made to be work cup down over the saya. The kozuka and kogai ana are set with thin very fine shakudo inserts. The design has been done by us