3 3/8" X 5 3/8" (85mm X 137mm)

(dome inkstamp) 1991

Picture courtesy Bob Scafe

3 3/8" X 5 1/2" (85mm X 140mm)

(skirt inkstamp)  / OTE   

{Made by Zsolnay factory}

Picture courtesy Bob Scafe

3 1/4" X 5 3/8" (85mm X 137mm)

(ear top inkstamp)

{Drasche}

Picture courtesy Bob Berry

3 1/4" X 5 3/8" (82mm X 137mm)

No markings

Picture courtesy Bob Scafe