Interesting
I would say there is no twist core there but certainly a difference in steel.
Like some I have and had, this is most likely an old collection piece that is covered in a protective film, the centre will be an open pattern laminated steel and the outer edges a different finely laminated and very sharp steel.
When cleaned they do present a very attractive blade. The fine lines I can not comment on but fine quality lines are not unheard of.
Gav
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