What is the value of Noritake China, from the 1950's, 12 place settings, pattern Rosay?

From what I found online, if the set is in good condition it's worth up to $700, but that's pretty high from what I found, and not for your exact pattern.

For your exact pattern I found place settings (plate, cup, saucer) for as low as $27 and as high as $42 per setting.