Randy,
Thanks for the explanation on the melanistic pheasant, very interesting.
Gary,
I'm not certain I'm qualified to say this but I do believe the round knob grip is more common on the early guns, meaning lifters. Those checkered round knobs are definitely my favorite with any type of pistol grip being acceptable.
Those guns with boat oars for a buttstock are just not pretty to my eye, but I will make an exception if the gun has enough of other favorable options going for it.
It probably is a good thing that I don't prefer straight grip, that way I'm not competing with everyone else when they come up for sale.
Stan