I don't know about serial numbers but you can go here: {
http://www.searsarchives.com/history.../sewing_id.pdf }
and use the model numbers. This chart says your machine was made 1970-1971. It would be made by Maruzen Jaguar in Japan, and is a very good machine. Currently I have 4 made by M/J and they all work superbly.
Got your PM, am gogitating about it. Will discuss it with Elaine when she awakens.
Joe