How Can You Tell an Original Stingray Chain Ring from a Repro?

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Just received a chain ring for a sixties Stingray I bought on ebay. It does not look original as was stated in the description. It looks to be a recent repro. Can anyone tell me if there is a way to tell them apart?
 

GTs58

I'm the Wiz, and nobody beats me!
Are you talking about the 7 hole juvenile chain ring that was used for decades? This one is a China reproduction and the teeth don't look like the actual Schwinn's. The finish looks like the metal was sand blasted and then plated.

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1. So there is no stamping on the originals?
2. Is the small positioning hole round or oblong on an original?
3. And were there different diameters of the Lucky 7 or were they always one size diameter?
 
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