Anyone know how the lead advance works on this?

Pilot Grandee 22k

The closest thing I have is the silver plated GRANDPRIX. But that design has a knock. You have to pull the upper half off like a cross pen to access the mechanism in the lower half to refill.

Since the GRANDEE doesn’t have a visible knock, I’d have to guess it is a twist-click, like a fumiraku.

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