Bernard Leach in Onda (1954)
Japanese pots, bowls and teacups rarely had handles until the modern age. There were some exceptions for ceremonial objects, but when handles were added they were mostly made of coils and therefore weak and quite fragile.
The European style pulled handle was unknown until it was introduced by British potter Bernard Leach on his second visit to Japan in 1934. Leach and Hamada Shoji had established the Leach pottery in St Ives, Cornwall in 1920. During this period they explored various pottery techniques known in Europe, including slip-trailing and the pulling of handles. Such pulled handles had been used on jugs and pitchers in Europe at least since the Middle Ages.