Reddit reviews Sakura (cherry blossom) Set of 5 porcelain dishes
We found 1 Reddit comments about Sakura (cherry blossom) Set of 5 porcelain dishes. Here are the top ones, ranked by their Reddit score.
The dishes are called 銘々皿（めいめいざら） and AFAIK they are used for individual pieces of food, mostly wagashi (japanese sweets). For example, this item looks rather similar to what you have.
No idea about the insignia.