The seller told me (see below)
Unica scale early 20th century.
height 9,5cm
28cm diameter dish
Diameter foot 9cm
The scale has a wide mark pontil on the underside.
There is one small " spot " in the uncolored and one spot of red color (probably a " contamination" of metal.
Check out the photos while the whole looks like a combination of a pebble beach.
No chips , cracks or pieces off. Only minor wear.
I bought it in north of Belgium.
Many thanks for reading my post, i hope someone can help me futher.