Reference for Gittin 54:4
אמר לך מי קתני אם אמר תנו נותנין ואפילו לזמן מרובה דלמא אם אמר תנו נותנין כדקי"ל לאלתר
R. Jeremiah said: [The Get is delivered after a lapse of time only] if, for instance, the witnesses say, 'We have never signed more than one Get in the name of Joseph ben Simeon.' If that is so, what does [the Mishnah] tell us? — You might think that we [still do not declare the Get valid] for fear that the name may happen to be the same and the witnesses may happen to be the same. Now we know [that we disregard this possibility]. R. Ashi said: [The Get is delivered after a lapse of time only] if the bearer can say, 'there is a hole at the side of such-and-such a letter,' which is a precise distinguishing mark. And that is, provided he says, 'at the side of such-and-such a letter', which is a precise distinguishing mark, and not simply 'a hole'. [R. Ashi ruled thus] because he was not certain if the rule about distinguishing marks<span class="x" onmousemove="('comment',' That a claimant to a lost article could make good his claim by mentioning a sign, and had not necessarily to bring witnesses. ');"><sup>4</sup></span>