Originally Posted by
Mickey2
The stitch length lever was introduced around 1930 on model 15, or just before, around the same time model 201 was introduced.
21st April 1932 - first run of 201's in the US, produced here until 1957. To narrow down when exactly when the 15 began to have that same reverse lever in the States, we'd need to have a look at as many 15's as we could with serial numbers beginning with the prefix AC & AD. =)