This is a Federal Holiday Shiur given in Kolel Zichron Amram. It discusses what are the common issues in older Sifrei Torah and newer Sifrei Torah, how to identify them, and how to recognize high-quality Mezuzos and Tefillin. Click on the link for the accompanying source sheet.
https://drive.google.com/file/d/162Drm2i3sR0-4uhREI3ECpmca7k0_ShX/view?usp=drive_link
My booklet on this topic is available on Amazon: