My Kenmore Convertible sewing machine was purchased new in 1979. I'm not sure when they were first on the market.
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I have the original bill of sale for mine from Simpson-Sears for November 14th, 1972. Hope that helps.
I bought my Kenmore sewing machine 158.194 in 1976, so before that time I would imagine.
My machine 1803L has paperwork for a Sears sewing class dated May 1974. It must have been manufactured just proir to that.
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