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Unfortunatley, I have no information about this. But try the search function here in the forum. There are some Hassy users here too, so this question might have been discussed & solved here already...
The original Contax MAM-1 fits Hasseblad lenses to Contax 645 body. I bought one two years ago and I paid US$300 for it. Kindai also makes one and I think it might be cheaper. In my opinion both adaptors are just as good.