Michael,
thank you this is very enlightening for me and extremely interesting, I Always saw the four a a half 8, actually now I see it is not.
If you rotate the Gothic 4 by 90 degrees you will indeed get the later 4.
Also very nice that you found and posted examples of these rotated 4 at the end of the 15th and begining of the 16thC century's.
best,
Jasper
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