Actually I think Kees and Manufactum sell the same Muller stones. Be aware though every dealer is different, even if the stones are from the same place. I know Kees sorts and inspects his stones as I do before selling to be sure any inferior ones are weeded out. We have both had issues with inclusions and have had to scrap or return stones. He would be a seller I would trust and i have one of his stones in my collection. I don't expect every dealer goes through that trouble.

Tony