When leather is cut into layers the split off layers called...splits....have no grain, and so are most often embossed with one. the type of grain embossed above would be chosen because it is proportionate to the article to be fashioned from the finished work, would be smooth around the curves and yes, gripable. and looks cool.
there is probably some historical gun-thing about it i don't know about, my explanation is just about leather in general.
susan
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