It is a lotus leaf frog pattern sencha tray that has been used and grown well.
This is what I myself have used many times at tea ceremonies.
Frog sculptures and poems are engraved on the front,
The back of the frog is casually engraved on the back.
Good Japanese sencha utensils have designs on these hidden parts, which I think is a highlight.
The size is easy to use as a daily tea tray for entertaining.