I'm researching a 19th-century portrait miniature (circa 1830) and I've discovered an interesting partial blind stamp on the back on the frame. It consists of the St Edwards Crown accompanied by some initials. They're tricky to decipher but the last letter (under the embroidery) is a W. Could it be a family coat of arms perhaps? I'm guessing that it's not simply related to the maker of the frame as I can't find anything comparable. Any ideas?