Looks like potters AB incised monogram?. Approx Height10" (25.5cms) x Width 5 7/8" (15cms) x Depth 2" (5cms) of flowers from back of plaque. Condition as seen in the photos. No cracks.

Brand: Handmade
Pattern: Flowers & Leaves
Type: Sculpture
Theme: Flowers, Studio
Material: Stoneware
Production Style: Art Pottery
Production Technique: Pottery
Subject: Flowers
Colour: Multicoloured