Skeeeets wrote:

Yeeaaappppp.... It sratched easy with a push pin 📌

So I guess it's just a fidget knife.... Serrations it is.

It may be that you're best ignoring the last video post. If the blade is some Chinese mystery metal you could be wasting your time with any efforts at hardening and tempering. Your call.

Edit: Letter opener. I call my Chinese Scarab a glorified letter opener, the blades metal isn't worth being called a knife for most purpose.