It measures approximately 4" H x 4" W at its highest and widest areas.
It has Wedgwood England etched on the base - so it is of First Quality range.
I have collected these since the mid 70's and sadly and emotionally I am now selling my collection of 73!!
I have the book and references (SG418) and consider myself quite knowledgeable on the subject. If you have any questions please ask away!