Agree, I have a Huffy Cantilever bike from the late sixties or early '70's and it look like this. The chainstays are relatively straight as compared to a Schwinn. The brazing on the tube joints is minimal. The rear dropouts look the same. Big with one small through hole. Huffy's from this time period seem to always have straight, as opposed to rounded cones. So, if you take the bottom bracket or headset apart you might find straight cut cones. My Huffy also had a Bendix hub. It was a pre-RB hub with no line or groove in the middle of the hub like a Red Band.

The front of the twin tubes on my Huffy has removable end caps made of steel. They are smaller versions of the end caps that were used on handlebar ends on Schwinn 10 speeds in the '70's and '80's. Does it have removable end caps, like you would be able to pry them out with a small screw driver?

I also agree that even though mine is labeled Huffy, that the same frame/bike could also be labeled Rollfast or other brands.

My Huffy also has not serial number on it. I remove the paint and still could find no serial number.