I have 3 different sets of demittasse cups and saucers. I would like to know how old these sets possibly are and their value for insurance purposes. The first set is made by Sabin Crest-O-Gold warranted 22K; the 2nd set is made by Black Bidasoa Spain and the 3rd set is a set that is stamped "occupied Japan". Any help would be appreciated. Thanking you all in advance. Siti