Morigin Internal Combustion Engineering Co., Ltd., Hitotsu, Shizuoka City, 1953-54
I've listed this under Morigin, but the Japanese Wikipedia also shows a model called the Sun Etch (サンエッチ号) as being sold by San Echi Seisakusho (サンエッチ製作所).
The Sun Etch produced by Morigin in 1953 featured a 90cc ohv 4 stroke engine and came in two versions: hand shift and foot operated gear change. Both operated 2 speed gearboxes, and the engine generated 3.8 HP and a top speed of 70 KPH. By 1955 they offered three versions, still with 125cc engines.