The watch case has a London import mark with the sponsor’s / importer’s mark of George Stockwell. Unfortunately there is no obvious date letter in your picture. Is there another hallmark on the inside of the outer case?
Phil
Looks like London 1910
Yes, that’s what it is.
Thanks everyone, it was my great aunt’s and she got it from her aunt, so that makes sense. She told me it was a ladies pocket watch and that was all she knew from her aunt.