From the French rules this drawing is overquoted, meaning it is not made under the rules of the Art.
We have a first dimension
"Thickness of the cylindric part of the rim" = 1.05 - 0.15
a second dimension
"Total thickness of the rim" = 1.65 - 0.15
Therefore we don’t need the "difference" = 0.60 (which furthermore given with no tolerance, this being an error)
I would like to know if NOWADAYS in the other countries (England, Germany, USA) it is the same (unnecessary over quotation, furthermore incorrect because the lack of tolerance)
Perhaps this drawing is correct because either it is not made under french rules or perhaps because the rules changed during the years.
This drawing is German and dated from 1920.
Perhaps the rules of this old time mean we must keep a constant difference between the two dimensions (due for example to the manufacturing process)
What do you think ?