Frankfurt an der Oder 1917 10 pfennig variants

Recently 2 Frankfurt an der Oder 1917 10 pfennig coins joined my collection. There are 5 variants listed as F#137.2a to F#137.2e in N#43646. The differences mostly are vaguely described with distances between the 1 and 0 in the value denomination. This can be interpreted as the distance between these digits halfway their height or as the minimal distance anywhere. Due to this, one of my coins might be F#137.2d (F for Funck), while it also could be understood as F#137.2e, see the image below.

Can someone please share how Funck defines 'distance' precisely, when at all? (I don't own a Funck catalogue book myself)

Here is an improved way to describe the differences between F#137.2c (left) and F#137.2d/e (right) that I created to add to the page of this coin later:

Does someone have a picture from F#137.2a? It would be nice to add an image of that variety as well.

And generally, what are your thoughts on the variants as described? F#137.2b might exist only due to a similar issue of the way to understand ‘distance between 1 and 0’, so far nobody has listed to own that variety as the count is at 0%. Similarly, only 0.7 of registered coins are listed as F#137.2d, which indicates in reality it might be the same as F#137.2e, due to just a different interpretation of ‘distance’.

E. Timmermans

Here is an improved way to describe the differences between F#137.2c (left) and F#137.2d/e (right) that I created to add to the page of this coin later:

What strikes me more than a dot more or less is the distance between the outer beaded circle and the lettering on the reverse.

E. Timmermans

 

…the way to understand ‘distance between 1 and 0’

I've always assumed the distance between 1 and 0 is measured in the middle of the numbers, where the 0 is at its widest.

Essor Prof

E. Timmermans

Here is an improved way to describe the differences between F#137.2c (left) and F#137.2d/e (right) that I created to add to the page of this coin later:

What strikes me more than a dot more or less is the distance between the outer beaded circle and the lettering on the reverse.

 

E. Timmermans

 

…the way to understand ‘distance between 1 and 0’

I've always assumed the distance between 1 and 0 is measured in the middle of the numbers, where the 0 is at its widest.

Thank you for noticing the remarkable difference in the distance between ‘KRIEGSGELD’ and the surrounding dots. I added that difference to the drawing and submitted it to the page on this coin in the comments. If you like, I can add your name to the images for noticing.

Indeed the more human interpretation of space or distance between the 1 and 0 is to measure the distance halfway, where the 0 is at its widest. The scientific interpretation is the minimal distance anywhere, when there is no precise specification.

Similar is how to understand ‘the size or diameter of a square coin’. On Numista pages generally the diameter is chosen between the left and right ends of the square, for example: N#9340

The size of that coin is given as 26 mm, while the distance between rounded corner edges is about 33.1 mm. This means that you need to put such a coin in a general coin holder of size 35 mm, while a coin holder of 27.5 mm clearly is way too small.
In my opinion, always both the minimal and maximal diameter should be listed when there is a difference. Yet, that is discussion material for a new topic, when it has not been discussed before.

I would hazard a guess that there will be a lot of variants in the notgeld coinage without the usual stringent mint checks you see in state coinage,