When was the Kenmore sewing machine model 158.143 produced?

The Kenmore's made by Janome have a source code of "385." This would be all Kenmores since about 1990-ish. In the 1970's and 1980's most of the Kemores either had a "158." (Jaguar/Maruzen) or "148." (Soryu) source code, but there was one Necchi made model in that time frame with the "340." prefix.

I found a site that said the Kenmore model 158 12511 was made in 1975.