Manufacturer was the Polish [i]Fabryka Porcelany Krzysztof[/i], post-WW2 successor of the German [i]Krister Porzellan-Manufaktur AG[/i]. As such, your item was created sometime after 1952.

The single number additions are irrelevant as they are merely internal production and control ID codes. A different matter are the so-called ‘dating codes’ that appear on and off on some items, e.g. “61121-1” which stand for year 19(61), month (12) and week (1) and show the internally keyed ID of the person who did the quality check, internal “-1”.

[i]Note that this info is only true for the ‘Fabryka Porcelany Krzysztof’ between 1952 and 1995 and is no general rule of thumb that can be applied to other manufacturers.[/i]