Your best bet is to contact Chris Marshall, the site owner of porcelainmarksandmore.com, although he does sometimes take a while to respond if he's obsessing with one of his projects. You'll need a better picture of the mark, however.
Also, it's quite common for the porcelain whiteware to be made by one company and decorated somewhere else. Pull your fingernail across the mark. If you don't feel the mark well, then it's probably underglaze and likely to be the porcelain maker. If you can feel the mark, the it's overglaze and likely to be the decorating company (which may or may not be the maker).
Forrest