Your pieces have printed outlines....the differences in placement you see are due to the printing being laid on the piece differently or to differences in how the hand done embellishments, coloring was added. The puzzle in the whole matter is the mark.....early showa period...1920's and after. BUT the McKinley tarrif act passed in 1891 made it illegal to import porcelain without the place of origin marked... Perhaps it was bought but not for import? Or imported into Germany? or perhaps at one time it had a paper label also attached....or perhaps the importer turned a blind eye....that happened some! All that said....it's still not worth much. I still say garage sale it....because the packing and shipping will be prohibitive. Someone may pay $50 for the set....but not when they have to pay another $30 for packing and shipping.

Linda C; My niece in Colorado bought a table and chairs from an estate and asked me tell them if they made a good buy. Maybe similar to the question the OP asked about the value of their furniture. I'll tell you what I did so you can learn something and it might be useful to you in the furture. I ask my niece if there was a manufacturers name on the bottom of the table. She found one and told me the name. I googled the name and lo and behold, there were about ten sites that were selling and buying this particular furniture. I found the year it was made and the price the furniture was selling for. This was not a well known factory. I believe this is the information the OP was asking for. Apparently you have never done this, so you might try it some time. I believe this might be better than a guess; or not Someone

any stamp on the bottom

I think the date mark is from 1868-1883. The Day of the month (at the top of the diamond) is 8; The Year (the right side of the diamond) is D which is 1878; The Month (at the bottom of the diamond) is B which is October. So the date would be October 8, 1878.