The Kesitah is an ancient Biblical form of monetary measurement that the value or weight of is no longer known.
[1] The word is translated from Hebrew meaning, "part, measure, piece of money."
The word appears in Genesis 33:19 and Joshua 24:32 where Jacob paid 100 kesitahs for land near Shechem.
Subsequently, the kesitah was probably a piece of money of a particular weight, cast in the form of a lamb (or unminted of a certain weight, the price of a lamb).
Monuments in Egypt show that such weights were used as a form of currency.