Genazym: The First Printing of the classic בֵּית מֵאִיר (1787), the author's own copy with extensive handwritten glosses on the sides!

Rabbi Meir Posner of Danzig (1725-1807), one of the leading poskim of the entire 18th century. R Akiva Eger used to send him his questions! A classic אב"ד of the "Old School"

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