Do you have proof for a 5 scale and a change to 10 scale?
Argument against this is that the dots were exchanged one to one into numbers, no recalculation.
There's never been a scale IMHO, except for meter speed. They left the "dots" indication when five became more frequent, more came in sight, but more dots are impractical.
Now, with the numbers, the "limit" was at least set to 9 - single digits.
My 2 Pfennig