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mixed filiation ms.n+M jr.n+M (late date excluded)

The filiation formula ms.n+mother's name was replaced by jr.n+mothers name around the late reign of Senusret I or the early reign of Amenemhat II. If nothing suggests a later date (when the former formula was reintroduced under the 13th Dynasty), the object featuring both formula should date from early to mid-12th Dynasty.

early to mid-12th Dyn.
Obsomer 1993a