What letter is this? If you say Beis then what does this mean about Mezuzah #1 from this post. What I did here is isolated the yud from that picture and rotated it a bit.
What I remember learning is that if a letter looks like any other letter, even rotated, upside down etc it is a shinuy tzurah. It seems pretty clear to me that this letter, when rotated is a beis not a yud.
Rav Weiner, in the comments you mentioned that the extra part could be scraped away. I have two questions:
1. Shouldn't you cover the letters around it (since its small size might mislead the tinok) and show it to a tinok?
2. If you are machshir this Yud wouldn't it be better to add ink instead of scraping so at least it's not a safek of Chok Tochos, since Shelo Kesidran is derabanan. Shouldn't we treat this like the case of a square Chaf Sofis which is brought in the teshuvah of the Tzemach Tzedek?