Ah.
Respectfully, I wouldn't go so far as to call round pusher chronographs waterproof. They certainly are more moisture resistant - and maybe at the time of production some companies marketed them as "waterproof" by comparing them to square pushers, but I think the term today is largely used for screw back cases - even for vintage watches. A snapback case is never going to be truly waterproof, I think.
I had noticed that the Longines you posted had a screw down case and assumed you had made a visual mistake with the OP's watch.
Maybe somebody else can chime in and clarify this for us?
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