Invisible stitch from both sides of leather - Sewing Leather

So my mentor has been insistant that i must sew this bag through the edges of the leather like wo, similar to a butt stitch but the idea is for it to be invisible on both sides I really dont even think that is possible since we live on the land of physics. What do you guys think Below is what

Invisible stitch from both sides of leather - Sewing Leather

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Invisible stitch from both sides of leather - Sewing Leather