Bizarre artefacts on imported mesh

Hi everyone! I recently modelled a character for my game, but had some problems with the mesh when imported to Unity. I’ve attached images containing my import settings and the mesh as it looks in both blender and Unity. I’ve messed around with a lot of settings to no avail. Does anyone know what could’ve went wrong?

(Apologies for the low quality of the photos, I’m having some technical difficulties)



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