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Yes, but you can more easily see it in the razor on the right.

Go to the link I posted and scroll down just below the drawings. The 2nd group of two pics. The one on the right, if you look closely it thins from the spine downward, and then just above the edge...

Rather than try and explain it, here's a link that will give visual input. The straight razor - Straight Razor Place Wiki The full hollow will have less weight, more flex in the edge and is noisier...