I never noticed this before on my mandolin, but there is a small hump running straight down the center of it. It starts off flat near just under the neck, and then becomes more of a hump as it gets to the center and passes under the bridge.
Its not just an optical illusion with the grain or anything - i can feel the hump in the top when I run my finger over it.
Is this normal? It's a Gibson A9.
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