Odd China Schwinn mountain bike headset...

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.

IDK but there is no upper cup and frame is threaded ?

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?

 

The top is a race instead of a cup. Kinda common for that era.
Schwinn also used similar headsets to the in the 50’s-70s. I think they’re cool personally

 

Thanks! Never saw one before. Is it like this?
Is the top race threaded into the frame?

 

Very common on Schwinn Corvettes . But trying to find a set is a lot of fun and expensive .

 

Here are pics of "bomb proof" fork used with above. Lol.

 

Exactly like that. No, it’s not threaded, pushed in like normal. Love the ‘splash’ style paint on that! So cool

 

And here it is all together again !