It’s a model 1700 with 4WD, circa 1981. Twoshelbys is correct that it was built in Japan by Shibaura for Ford. Although it’s classed as a “compact tractor”. It’s significantly beefier than most in that category. Basic tractor is about 2650 lbs, and 3000+ with the front loader. 25 HP 2-cylinder Diesel engine, etc.