That it isn't. It's a Westfield/Columbia, without any doubt. L-shaped dropouts, characteristic fork crown, typical seatstay joint at the seattube, unique headset races, etc.

Wouldn't suggest this guy for motorization. Never had a Columbia BB or headset that fit quite perfectly here - races commonly too loose in the frame. Enough that the vibration of the motor may cause some odd loosening of components now and then. Columbia frames themselves are whippy in the first place, even men's diamond-framed models - she'll start wobbling out from under you by the time you hit 19mph.

Dig up a Raleigh Sports - although Raleigh did some absolutely lousy lugged-frame brazing by the late '60s, most of them will be far superior to this little number. Leave the Free Spirit for leisurely rides around the neighborhood...

-Kurt