Please be more pacific on the type of leather: aniline dyed, semi-aniline, pull-up, pigmented, By-cast or.....
Not many upholstery manufacturers have their own tanneries, so this kind question is not furniture manufacturer pacific, as it applies to all.

I am not sure at this point which specific leather--it may change. I am looking at the finished ones that have an F at the end of the number. I understand this is best for my needs, I hear BY has re-graded some of their leathers & the one I liked has been upgraded to the London park from the Kingstown--so I guess it went up. My question is how close--if you ordered--was your leather to what you wanted--are you happy with the BY item?