nib engraving is deeper and more defined than 4G v1.
nib engraving can be diversified from now on (currently 3 variants)
below are some examples, more design types will be made (may be notified later)
below photos are magnified at least 70~100x original size (pc view)
they are handmade nibs, so some differences exist.
the differences can be seen under big magnification, they are difficult to see under normal view.
