G.T., when a shotgun's stock is biased to one side or the other it's called cast off or cast on. The stock you describe has cast on for a right handed shooter.
I bought a Winchester Model 101 O/U shotgun when I was in England and had a gunsmith there apply cast on to the stock. It was done by using hot oil to soften the wood fibers and then bending. I hold my head up and when I bring the shotgun to my shoulder the rib is perfectly aligned with my eye. I do not have to tilt my head over the comb.
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