@Anna N I never thought to look up "bottle opener knife" Although there's no wavy blade (which I would love to proselytize buy gifting them), out of the 100 or so photos I came across, there were knives with bottle openers (attached). So that at lease solves that those grooves are indeed for bottle opening. But still, why the "wavy blade"?
@rotutsThat fish comment jogged my brain. Although I think she was just trying to pawn off her wares, I seem to recall the women (who I also believe was definitely not the original owner) saying "it's for descaling fish" IMMEDIATELY AFTER she said "I don't know".
Fun fact: That day I went walking around the stands specifically looking for a metal gear "vintage" egg beater and she happened to have one! So this "bread knife v2.0" was the bonus find.
