Schwinn Middleweight Fork ID

[Driftpr]

Go drink another coffee hahaha that is no fastback fork. Fastback is a lightweight fork

 

[Oilit]

Also when do you see a middleweight fork that clean off the original bike? Mostly off tandems, no one wants them for more then their parts and the tend to be in real good shape because people get scared after they first try to ride them and they get stood up in the garage and left alone. At the very same time I know , we will never know hahahaha

I believe you're right, the tandems had reinforced forks compared to the other middleweights, and that one looks right with the steering tube sticking down through the fork crown. I've got one like that and was told it was from a tandem.