The ring I posted that was off a 65 crank has a slight oval, it's not round. The repop I posted has a long oval and an overall crappy appearance. Yours looks like a Schwinn made ring to me judging by the finish and teeth which are more chisel looking. You have to understand that Schwinn used this ring for over 40 years and slight variations on any parts made that many years is common. The oval may have been enlarged sometime after 1965. The repops definitely don't have the finish/plating that yours has. The teeth in that Chinese ring look like little toes to me. LMAO
Yes, the pics you posted look like a legit sprocket. It's all about the forging shape and the beveled teeth. There were Lowrider brand sprockets made too with a very mirror like finish, but a very "square" forging. There are also larger tooth count sprockets made today that are pretty convincing in scale, but Schwinn only originally made them in the one smaller size. The larger ones I'm talking about seem to come in different grades of finish too...
Here are a couple NOS Lucky 7 front sprockets (56 104 / 6306) that came on the Stingray.
There are No stampings, the small hole has a very slight oval to it and the chrome is smooth and shiny.
36 tooth - 1/2’’ pitch.