You have a 69-72. that machine is a walking foot machine but without 4 motion drop feed, rather skip feed. That means feed dog moves backwards, forwards but does not drop down. Used for binding machines. The E42 are the feet that was on the machine originally. This machine uses the same feet as a 67, 167, 267, 68, 168. 268, 269, 169. Generic feet are made and fairly cheap. Still a good machine.
glenn