Old Engines in Japan 1960s STIHL Diesel Engine Type 135 10hp

This is a 2 cycles single-cylinder diesel engine of the forced air-cooling considered that it was used by the Japanese tractors of the 1950~1960s ISEKI and KUBOTA. It is like the thing which produced an engine of STIHL Corporation which is a German chain saw maker under license in Japan. The description is written on an oil cap. "Use heavy duty oil of diesel automobile, generally 30, winter 20. Please clean the oil filter when changing lubricating oil."

STIHL Diesel Engine Type 135
10hp/2,000rpm 496cc
Around 1961
Manufacturer : VICTOR Auto Co., LTD. [licensed production]
Manufacturer's Location : Kawasaki-shi, Kanagawa, Japan?

This Engine is not my thing. I observed this engine at 2014 Kochi-Miyanomae engine show.

http://www.nicovideo.jp/watch/sm25443036
[いにしえの発動機たち] 1961年 スチールディーゼルエンジン135型 10馬力
2014年高知宮の前発動機運転会で見学させていただきました。