Unmarked pierced or lattice basket german

Sergio likes pierced porcelain. We have several pieces. I went to Buenos Aires last week and take this wonderful basket as a present. I have little time to search and less money than time, and was tired because traveling all night by buss and then working is demanding. I search for something in a shop near the hotel http://www.casalines.com.ar/ . The seller is an old man and is very polite. The prices are not high, though here things are now more expensive in Buenos Aires than in London or Paris. This basket was no so expensive probably because it is unmarked. I could appreciate the high quality of the porcelain, white and glossy. Then I found an almost identical blank in mercadolibre http://articulo.mercadolibre.com.ar/MLA-547695619-monijor62-antigua-canasta-calada-de-porcelana-alemana-29-cm-_JM that is mark “marca Z Alemania”. I think that it is a Zell product because in the Porcelain marks and more http://www.porcelainmarksandmore.com/germany/baden/zell-03/index.php it is stated that
“Vereinigte Zeller Fabriken Georg Schmider (1898 until 1990) In 1899 both the Upper and Lower works were slightly damaged by a massive fire that broke out in the middle of the town, only to be followed by another blaze in 1904. But Schmider was not put off easily as his products were a constant success and in 1907 he was finally able to take over the 'Upper Factory' from the Carl Schaaff company. Over the years the items from the Zell works were exported to Africa, Austria, Belgium, Canada, Denmark, Holland, France, India, Italy, Norway, Romania, Sweden, Switzerland and the United States. But not only self-marked items were sold; apparently quite a few goods were also sold as unbranded or customer-branded ware. One example would be from the period between 1907 and 1928 when the company sold at least one series of decorated but unmarked plates to the US importer ?L.D.B. & Co. from New York who also ordered items from a few other German companies like the ?Porzellanfabrik Moschendorf A.G. Thanks for any other data you can have.”