This looks like the classic modern case with a semi-skeletonized dial (probably from classic modern dial as well). It certainly is an unusual piece.
If you google "oris 7481" (the number on the caseback, denoting the model number), there are a handful of watches with the same odd cutout.
Hi Benjamin, I'm anything but an expert on fake Oris watches but one of the simplest ways of spotting a phony is that the rotor is half moon shaped and does not have the little cut outs like yours has. I'm guessing the watch is pre 2002 when Oris introduced the red rotor and fitted gold or silver coloured ones instead.
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