Any info on Schwinn American

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this bike has 4 sprockets and 2 chains. Schwinn American
 

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I've got no information about that Schwinn, but it reminds me of something. White Industries sells a crank/sprocket combo like that, the Double Double, so your single speed can have two ratios.
double_355x530_662895c1-ed04-422f-909b-17eb9250b132_400x.jpg
 
Is there any kind of clutch mechanism on the front chainrings? Any markings, brand, model name/number on the rear hub?

It is fascinating...more pics would be greatly appreciated to try to discern how it is supposed to work.
 
The value is in that it is a King Size American. I don't think there is anything factory with that dual chain setup. Mostly likely some backyard engineering or some snake oil kit sold back in the day.
I came to say what @RustyGold said. Regardless of the gearing set up, it looks to be a pretty good shape King Size. Considered one of the rarer middleweights. The set up on it with the chain is definitely not stock.
 

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