Reference for Ketubot 131:10

שום במנה ושוה מנה אין לו אלא מנה שום במנה היא נותנת שלשים ואחד סלע ודינר ובארבע מאות היא נותנת חמש מאות מה

[If a husband is requested to enter in his wife’s ketubah] “goods assessed at one maneh”, and these are in fact worth a maneh, he only [must agree to] a maneh. [Otherwise, if he is requested to enter in the ketubah:] “goods assessed at a maneh”, his wife must give him thirty-one sela and a denar, and if “at four hundred”, she must give [him goods valued at] five hundred. Whatever

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