Here we have a typically flamboyant Louis XV inspired swept frame. It is a British Victorian revival style of the original, much earlier Louis XV period frames. I call this a double swept, because the back edge also has sweeping lines, the ornament is made from composition.
It has an original label: 'Bourlet & Sons', who are a very well known, long established English frame making company. The Bourlet company also dealt with art shipping and packing, so the label may not be a makers label. I don't know the meaning of 'Worcester 1901' on the label.
