Oooh finally! I have my mitts on a jet black glass flower frog. Thank you ECLECTIC, I am so delighted. It is matt black but when you hold it to the light it is actually the deepest shade of purple wine. It has 4 1/2 MADE IN ENGLAND PATENT 7830/1910 embossed on the bottom. I love the weight of flower frogs and their strange forms which could be seed pod botanical or part of a machine.