Since no production records exist that I know of, the best I can tell you is that the S370 was sold in this country from 1978 to 1982. By 1984 we were selling the Mitsubishi MT372 which was an improved model using many of the components and sheet metal from the Satoh S470 but still using the KE70 2 cylinder engine. Call 800-609-5110 if you need more info. Bill Rodgers