Yosef Karo

“ If the document says gold currency, the borrower would give the smallest amount of gold currency that is used. If the document says gold dinarim or dinar of gold, the borrower would give two gold dinar. If the document says gold in dinarim, the borrower would give gold that is worth two dinars of silver. In today’s age there is no distinction between saying “dinarin” or “dinari.”
Paragraph 14- If one produces a document against another with a sum of 100 dinar or selaim and the currency is undefined and it was written in Bavel, the lender would collect Babylonian currency. ”

“ This is only true with respect to a loan document. With respect to a kinyan document, however, it would be valid. Any document that is not made as the Rabbis instituted is invalid, even if there is no rationale to invalidate it. Therefore, if one were to make a tied-up document today it would be invalid. There are those that disagree and we rule like those opinions. See later 44:1.
Paragraph 2- A document can be written in any language and any script so long as the scribe is careful that there is no modification in that text. ”

“ Given that we do not make the deduction and we know the document was erased, the document is now disqualified and one cannot collect with it. With respect to one letter, however, we would make the deduction, even if the top word only had two letters and we are using it to deduce half a word. If something was missing but there was no erasure, and the top said Chanani and the bottom said Chen, that is certainly a retraction because a scribe would not err on two letters, and the party must pay Chen. ”