Can anyone tell me if this knife is INFI or not?

Probably not. I haven't seen any apprentice blades that are INFI. I think Jerry only lets the apprentices work on less expensive steel!
 
The ricasso looks clean, but the butt looks like there's some dimples.
Carbon steel should either be A-2 or 5160 if it isn't INFI.

You can try the bluing test. Get it super clean with dish soap or degreaser, then touch a spot with bluing acid. If it turns color it's not infi.
 
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