This is a Czechoslovakian painted wood plate. It is looks like inlay but it isn't, its painted.
Its from DH's "collection" of vintage things. I'm not sure how old it is, there is no mark at all on the back, but probably the mid-20th century. (It is definitely no later than the late 1960s).
To see some lovely Czech painted boxes from the 1920s, go here.
For more wonderful vintage treasures, stop by Coloradolady and join in the vintage fun.