It is my understanding that this machine, the 158.904 was manufactured in 1987 in Canada
it is a 1959 Kenmore Tri-Span 88 Model 88. It was the Elite top of the line sewing machine for it's day made by Janome in Japan.
Here is a published list of models and the year they were made
http://www.searsarchives.com/history/files/sewing_id.pdf