Hello Jens,
Visually I think that it is made of two parts but when I tried you ''trick'' it still sounds like a bell.
For the pattern, maybe it is a recent blade on an old handle but I really don't think it can be acid etched,
for remove the rust, I scratch at least 1mm on the blade surface
after the soft acetic acid bath.
the pattern would disappear or be reduced with this treatment but it is clearly present and enhanced on the side of the blade too.
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