The Esterbrook 9128 renew point nib is direct descendant of the earlier 128 dip nib. Below you will find some images from vintage catalogs.
The two 9128 I have been testing have different amounts of flex. I have noticed that the England version of these nibs are more flexible than American cousins.
NOS nib
The NOS nib is quite stiff but after drawing some figure eights it is no longer scratchy and shows a little bit of line variation.
Used nib
The other nib, with a green mark on the screw section, is a lot nicer to the touch and is quite a sweet nib when writing and drawing. Looking at the boxes more line variations are visible on it. The descending “L”s are more fluent on the used nib when comparing the two.
Comparing the two I prefer the old nib but suspect that the NOS with use will show more character.