As you can see in the last photo, the subject of this plaque is a mate to either twt3286 or twt3078. That last photo also shows the variations found in tricolor jasperware plaques.
As we have had this same plaque before, albeit not in this color combination, we can say that it is German, likely Schafer & Vater as we have found it with a variety of markings before such as just the word 'Germany', the Schafer & Vater hallmark impressed, or just numbers.
It measures approx. 7 1/4" x 5 3/8". The thickest part measures 1 3/4" (at the top). It has holes for hanging (currently there is a sturdy string that allows hanging immediately).
The condition is excellent with no chips or cracks or repairs. There are a few color skips in the deep green but those occurred in the making.
We specialize in these plaques so if you are interested, please search my site with the word 'jasperware' and it will bring up about 50 other items.