I found this corset hidden away the other day in my collection. I found this corset, to my surprise, at a doll show quite a number of years ago. While I don't know much about corsets I was informed from Lara Corsets that this corset is from around 1902-1903.
It is marked Royal Worcester, style 557. I was researching online and found an article reprinted from a 1911 Modern Priscilla magazine about the factory.