I believe this Art Nouveau buckle may have been a Nurse’s buckle from the early 1900’s in England. I have seen similar ones on Antiques Roadshow on T.V.
It is E.P.N.S. and backmarked E.G. Stott. The flowers appear to me to be fuschias. What a beautiful design. It is a large buckle being 9 cm. X 5 1/2 cm. I have had it many years, long before I started collecting buttons.