Odd China Schwinn mountain bike headset...

Apr 1, 2014
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Stripping a 90's Schwinn Frontier 26" mountain bike. Does have a bike shop sticker so not from wally world.
After pulling the fork, I thought I'd drive out the cups for spares as I'm scrapping the frame.
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IDK but there is no upper cup and frame is threaded ?
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Weird, what is going on? Does the top bearing mount upside down from what I'm used to?
Why is it threaded? How do I remove it?