Blue/grey bowl,plate 3 open salts
I'm trying to identify the origin of these items,possibly put a date to them, Or at least know what the markings mean. (the markings on the bowl and plate are similar but have different centers. Out of the three "salts" I sent the picture of the best mark, And that one is even hard to make out. Maybe the pattern of it holds some information?
I have searched around all week and i am more confused then when i started, any help would be much appreciated.