I have 2 variants: bold "J" and a thin "J" mintmark.
See the pictures that I made from my own coins.
In the numista website list it is not mentioned.
Would be possible to create a new line for each variant (like in 5 Pfennig 1950 - KM#107)?
Or shold I consider it like a "mintmark error"?
Sincerely,
Paulo