jurek and jadarite: The difference in the quails is the kanji [japanese character] that shows up on the top of the piece. 右 = "migi" = right 左 = "hidari" = left
鶉 = uzura = quail
I suggest you use nihongoresources.com to search for the characters. :) Very good work so far.
Sorry, i didn't read more than a few posts down. If you need any help hunt me on msn: andre_c_neves [AT] hotmail [DOT] com