Migueldiaz, here are a few poor pictures (it has been raining here for the last three days) of some that have the humpback feature that you show in your above pictures. I tried taking these with and without a flash but the ones without the flash you could not even tell what was in the picture. The blades that look shiny are a lot darker than they look in these pictures, especially the one in the last picture. I hope that they will be of some help to you.
Robert
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