This was my great-grandmother’s.  No idea how old it is.  My mother saved it all from going to Goodwill after they found it all in boxes in my grandparent’s basement.  They are similar in design, but the plates have no marks at all.  Certain other pieces like the cups do though.  This is about 1/3 of it all.  I’ve been told that it’s bone china.  I have no idea if that is actually the case.  My assumption given that it really has no marks is that either really old, or a really modern, cheap mass manufactured set from the 60’s or 70’s when my great-grandmother was still alive.