try searching again "schaller bavaria" + china

Or "Oscar Schaller"

Posting a photo here could help, as well.

Here is a link that might be useful: Google search

thanks for info, shall try again. i see we have the same b'day! conala

I did a quick google and found some blips here and there, and some pieces for sale ebay and other sites. Different marks for different time periods. Suggest you get your hands on a copy of Kovel's (library, bookstore, web), see what you can find in there. One of the links I ran across mentioned it's in Kovels. They say the company began in 1918 at that link.

Does the backstamp only say "schaller bavaria" or are there other markings as well?
The plate pictured in the link posted by moonshadow is plainly from the period when Germany was partitioned.
The site linked below shows the various marks used by Schiller and the time period for each. There were several factories under the Schiller name....but notice that almost all use the "s" symbol for Schiller.
Linda C