Byzanta Ware hyacinth vases

I was lucky enough to find another Byzanta Ware hyacinth vase on ebay this week. I have never found anything about these - aside from my own experiences.

gold rim, unlike my other two

base with Byzanta Ware mark, including Grimwade's Stoke-on-Trent

I also a blue lustre and an orange flowered Byzanta Ware hyacinth vases.

base of the orange flowered vase

base of the blue lustre vase