I'm offering a set of two brooches: a sleek, cool-designed brooch by the British company Sphinx, and a leaf-motif openwork brooch without a signature. The Sphinx brooch has a serial number. The heavy metal with its subdued gold plating and sophisticated design is wonderful. (The other one is also cool.) Sphinx Founded in the UK in 1948, Sphinx gained popularity for its beautiful designs and exquisite craftsmanship. In addition to its own products, it also supplied products as a factory to famous American costume jewelry makers and department stores, but production ceased around 2000. The markings include SPHINX, as well as a manufacturing number consisting of letters and numbers, either both or one of them.