You got bit by a common problem on the old svgs. It was dimensioned in px (probably at 72DPI because it is old) and thus on a modern editor (96DPI) such as Inkscape, the scale is wrong. So I rescaled it, converted it to current graphics standards and corrected the pin labels (2 and 3 are reversed) then ran it through FritizngCheckPart.py to remove the px from the font sizes to produce this new svg:
and this test part to make sure it works correctly
pot-new-schematic.fzpz (7.9 KB)
Peter