Art Nouveau retailer Sterling floral brooch/pin

Vintage Art Nouveau floral brooch made and stamped “Sterling”. Through research I found that it is probably designed by Anthony Flower but it doesn't have his hallmark.
The brooch retailer has beautiful detail which I hope you can see in the photos. If you need more, please let me know. I'm happy to provide more information. The brooch is 2 1/4” w by 2” t and is in good working condition. It weighs 25 g.
My items are shipped in a turquoise gift box and then in a bubble envelope. Soon I'll be switching to cardboard boxes for actual shipping.
Thanks for looking!.