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6700
Check the spline depth. Because the 7800 hub design had already been dumped before 6700 was released, the compatibility charts are silent on the question, but Shimano may have carried over the 7800 compatibility from 6600, since 6700 would probably have been signed off before they saw the error of their ways re. 7800.
gbj_tester
I've got a few 6700 cassettes if you want to stock up.