This throw appears in Gichin Funakoshi’s 1935 book “Karate-Do Kyohan”. The throw is called “Tani-Otoshi” (valley drop) by Funakoshi; although it is more commonly known as “Ippon Seoi Nage” (one armed shoulder throw) in the wider martial arts world.

All the best,

Iain

PS The YouTube link can be found HERE