You will see that the SC calf prices start from EUR995 (non EU) and that is not too far from the price on those Vass shell chukkas. As I said I have been quoted 1130EUR for the SC chukkas with shipping, which is lower than the EUR1362 you mentioned.
So I really wanted shell chukkas, I would rather pay a 100-150 eur extra for SC quality in calf.
Much as I like Vass shoes, SCs are better built at least to my eyes and touch.
I am not sure the point of comparing SC's CALF prices to VASS Shell prices. Vass calf prices are roughly half to a third of SC's calf prices. Pretty significant to me.