Longines 5982-5 with 13zn?

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Hi Gents,

just found this auction in Klaaswaal. The house is selling something they call: Longines Flyback Chronograph "13ZN" 5982-5

As far as I know 5982 didnt have 13zn but 30CH inside.
I'm not at a level to say for sure if the movement is actually 13ZN or 30CH.

Can someone share their thoughts please?