I was raised with a Winchester 67, which looks a lot like a 60. I'm not sure what was changed, M-60 to M-67. The Blue Book says the change took place in 1934.
Those are great little guns of fine quality. Mine has a Walnut stock and the trigger is pretty good.
One of those would be a heap better for a youngster than a Chipmumk...
The Remington equivalent is also a nice gun.
DF