Yeah, Ashtabula sold the forks to Schwinn, so they could have sold them to Columbia too, right? I don't know but it seems plausible.

Man those are bad forks though. On my Schwinn Twinn, I could get the rim to rub the brakes easily by standing to pedal, or just taking a sharp turn like a U-turn in the street. The axle was not slipping in the dropouts, it was just the fork flexing sideways. The fork is super heavy and way too flexible side-to-side. Many of you know this, but for those who don't: the blades are not tubular, they are solid steel. But too narrow to have much lateral stiffness.

I put an '80s MTB fork (from a Schwinn MTB at least) on the Twinn, because we actually ride it a lot, and historical accuracy is not high on my list of requirements for that bike. The bike was totally transformed by the fork, and the cantilever brake it also allowed. The previous "brake" has to have scare-quotes around it because it hardly qualified as a brake. Almost as weak as the rear brake on that bike, an Atom drum brake.

We have steep hills here, so tandems need brakes.

Mark B in Seattle