A minor correction to your description. Shell cordovan is too flimsey to use as a stand alone material for holsters and belts and must be laminated to either a cow or horsehide backing to obtain the needed firmness. Some makers refer to their horsehide as shell horsehide, but it is NOT the same as shell cordovan. If you are ever up in Boise, Sawbones, I'd be happy to show you a hide and you will see what I mean.SAWBONES said:None of the "exotic" leathers is actually used as a foundation for a holster nowadays.
(Shell cordovan, that is, horse muscle fascia, is an exception, being used full-thickness in holster manufacture. This is a very fine-grained leather which wears well, and looks quite nice. It isn't typical shoulder "horsehide", but a non-hair-bearing layer of tissue.)