LOl I should have done this first - Knopfsammler lists the crown buttons as 'Hof- und Staatsbeamten, Livree / Livery Deutschland / Germany Freiherrenlivree' so it would be a livery button for a Baron's household. The S button is listed as 'Hof- und Staatsbeamten, Livree / Livery
Deutschland / Germany Buchstabenlivree; S' so a button with an S on it. I presume the o button is also livery.
Only saw thise post now, sorry!
Yes you are right on most of it.
Most button retailers had several standard collections of button's with these crown's and letters in different size's .
And where ment to be cheapper buttons for anyone in need of them and didn't want or could affort theyre own design.
Always looking for Belgian Congo stuff!